Note: This README/NEWS file refers to the source tarball. Some things described
here may not be available in binary packages.


This is a bugfix release recommended for all users. Please refer to the
ChangeLog file for details.

The ClamAV team (


ClamAV 0.97 brings many improvements, including complete Windows support
(all major components compile out-of-box under Visual Studio), support for
signatures based on SHA1 and SHA256, better error detection, as well as 
speed and memory optimizations. The complete list of changes is available 
in the ChangeLog file. For upgrade notes and tips please see:

With Sourcefire, Inc. acquisition of Immunet Corp., ClamAV for Windows
3.0 has been renamed Immunet 3.0, powered by ClamAV. This release
contains the fully integrated LibClamAV 0.97 engine for offline,
OnDemand, and OnAccess scanning. Immunet 3.0 users can now utilize
the full power of the LibClamAV engine, all the ClamAV signatures,
and creation of custom signatures on any platform running Immunet 3.0,
powered by ClamAV. If you run Windows systems in your environment and
need an AV solution to protect them, give Immunet 3.0, powered by ClamAV
a try; you can download it from

The ClamAV team (


ClamAV 0.96.5 includes bugfixes and minor feature enhancements, such as
improved handling of detection statistics, better file logging,
and support for custom database URLs in freshclam. Please refer to the
ChangeLog for details.

The ClamAV team (


ClamAV 0.96.4 is a bugfix release recommended for all users.

The ClamAV team (


This release fixes problems with the PDF parser and the internal bzip2
library. A complete list of changes is available in the Changelog file.

The ClamAV team (


ClamAV 0.96.2 brings a new PDF parser, performance and memory improvements,
and a number of bugfixes and minor enhancements. This upgrade is recommended
for all users.


This is a bugfix release, please refer to the ChangeLog for the complete
list of changes.

The ClamAV team (


This release of ClamAV introduces new malware detection mechanisms and other
significant improvements to the scan engine. The key features include:

    - The Bytecode Interpreter: the interpreter built into LibClamAV allows
      the signature writers to create and distribute very complex detection
      routines and remotely enhance the scanner's functionality

    - Heuristic improvements: improve the PE heuristics detection engine by
      adding support of bogus icons and fake PE header information. In a
      nutshell, ClamAV can now detect malware that tries to disguise itself
      as a harmless application by using the most common Windows program icons.

    - Signature Improvements: logical signature improvements to allow more
      detailed matching and referencing groups of signatures. Additionally,
      improvements to wildcard matching on word boundaries and newlines.

    - Support for new archives: 7zip, InstallShield and CPIO. LibClamAV
      can now transparently unpack and inspect their contents.

    - Support for new executable file formats: 64-bit ELF files and OS X
      Universal Binaries with Mach-O files. Additionally, the PE module
      can now decompress and inspect executables packed with UPX 3.0.

    - Support for DazukoFS in clamd

    - Performance improvements: overall performance improvements and memory
      optimizations for a better overall resource utilization experience.

    - Native Windows Support: ClamAV will now build natively under Visual
      Studio. This will allow 3rd Party application developers on Windows
      to easily integrate LibClamAV into their applications.

The complete list of changes is available in the ChangeLog file. For upgrade
notes and tips please see:

The ClamAV team (


ClamAV 0.95.3 is a bugfix release recommended for all users.
Please refer to the ChangeLog included in the source distribution
for the list of changes.

The ClamAV team (


This version improves handling of archives, adds support for --file-list
in clamscan and clamdscan, and fixes various issues found in previous

The ClamAV team (


This is a bugfix release only, please see the ChangeLog for details.

The ClamAV team (


ClamAV 0.95 introduces many bugfixes, improvements and additions. To make
the transition easier, we put various tips and upgrade notes on this page: For detailed list of changes
and bugfixes, please see the ChangeLog.

The following are the key features of this release:

    - Google Safe Browsing support: in addition to the heuristic and signature
      based phishing detection mechanisms already available in ClamAV, the
      scanner can now make use of the Google's blacklists of suspected
      phishing and malware sites. The ClamAV Project distributes a constantly
      updated Safe Browsing database, which can be automatically fetched by
      freshclam. For more information, please see freshclam.conf(5) and

    - New clamav-milter: The program has been redesigned and rewritten from
      scratch. The most notable difference is that the internal mode has been
      dropped which means that now a working clamd companion is required.
      The milter now also has its own configuration file.

    - Clamd extensions: The protocol has been extended to lighten the load
      that clamd puts on the system, solve limitations of the old protocol,
      and reduce latency when signature updates are received. For more
      information about the new extensions please see the official
      documentation and the upgrade notes.

    - Improved API: The API used to program ClamAV's engine (libclamav) has
      been redesigned to use modern object-oriented techniques and solves
      various API/ABI compatibility issues between old and new releases.
      You can find more information in Section 6 of clamdoc.pdf and in
      the upgrade notes.

    - ClamdTOP: This is a new program that allows system administrators to
      monitor clamd. It provides information about the items in the clamd's
      queue, clamd's memory usage, and the version of the signature database,
      all in real-time and in nice curses-based interface.

    - Memory Pool Allocator: Libclamav now includes its own memory pool
      allocator based on memory mapping. This new solution replaces the
      traditional malloc/free system for the copy of the signatures that
      is kept in memory. As a result, clamd requires much less memory,
      particularly when signature updates are received and the database is
      loaded into memory.

    - Unified Option Parser: Prior to version 0.95 each program in ClamAV's
      suite of programs had its own set of runtime options. The new general
      parser brings consistency of use and validation to these options across
      the suite. Some command line switches of clamscan have been renamed
      (the old ones will still be accepted but will have no effect and will
      result in warnings), please see clamscan(1) and clamscan --help for
      the details.

The ClamAV team (


This is a bugfix release, please refer to the ChangeLog for a complete
list of changes.

The ClamAV team (


ClamAV 0.94.1 fixes some issues that were found in previous releases and
includes one new feature, "Malware Statistics Gathering." This is an optional
feature that allows ClamAV users optionally to submit statistics to us about
what they detect in the field. We will then use these data to determine what
types of malware are the most detected in the field and in what geographic
area they are. It will also allow us to publish summary data on
where our users will be able to monitor the latest threats. You can help us
by enabling SubmitDetectionStats in freshclam.conf.

For more details, please refer to the ChangeLog and

The ClamAV team (


Sourcefire and the ClamAV team are pleased to announce the release of
ClamAV 0.94. The following are the key features and improvements of this

  - Logical Signatures: The logical signature technology uses operators
    such as AND, OR and NOT to allow the combination of more than one
    signature into one entry in the signature database resulting in
    more detailed and flexible pattern matching.

  - Anti-phishing Technology: Users can now change the priority and reporting
    of ClamAV's heuristic anti-phishing scanner within the detection engine
    process. They can choose whether, when scanning a supicious file, ClamAV
    should stop scanning and report the phish, or continue to scan in case the
    file contains other malware (clamd: HeuristicScanPrecedence,
    clamscan: --heuristic-scan-precedence)

  - Disassembly Engine: The initial version of the disassembly engine improves
    ClamAV's detection abilities.

  - PUA Detection: Users can now decide which PUA signatures should be loaded
    (clamd: ExcludePUA, IncludePUA; clamscan: --exclude-pua, --include-pua)

  - Data Loss Prevention (DLP): This version includes a new module that, when
    enabled, scans data for the inclusion of US formated Social Security
    Numbers and credit card numbers (clamd: StructuredDataDetection,
    clamscan: --detect-structured; additional fine-tuning options are available)

  - IPv6 Support: Freshclam now supports IPv6

  - Improved Scanning of Scripts: The normalization of scripts now covers

  - Improved QA and Unit Testing: The improved QA process now includes
    API testing and new library of test files in various formats that are
    tested on a wide variety of systems (try running 'make check' in the source

For more details, please refer to
and to the ChangeLog.

You may need to run 'ldconfig' after installing this version.

** This version drops the special support for Cygwin. Our QA process showed
** serious problems with ClamAV builds under Cygwin due to some low-level
** incompatibilities in the POSIX compatibility layer, resulting in unreliable
** ClamAV behaviour.

The ClamAV team (


This release fixes a problem in handling of .cld files introduced in 0.93.2.

The ClamAV team (


This release fixes and re-enables the Petite unpacker, improves database
loading and solves some other minor issues.


This version improves handling of PDF, CAB, RTF, OLE2 and HTML files
and includes various bugfixes for 0.93 issues.

The ClamAV team (


This release introduces many new features and engine enhancements, please
see the notes below for the list of major changes. The most visible one
is the new logic in scan limits which affects some command line and config
options of clamscan and clamd. Please see clamscan(1) and clamd.conf(5)
and the example config file for more information on the new options.

Most important changes include:

  * libclamav:
    - New logic in scan limits: provides much more efficient protection against
      DoS attacks but also results in different command line and config options
      to clamscan and clamd (see below)
    - New/improved modules: unzip, SIS, cabinet, CHM, SZDD, text normalisator,
      entity converter
    - Improved filetype detection; filetype definitions can be remotely updated
    - Support for .cld containers (which replace .inc directories)
    - Improved pattern matcher and signature formats
    - More efficient scanning of HTML files
    - Many other improvements

  * clamd:
    - NEW CONFIG FILE OPTIONS: MaxScanSize, MaxFileSize, MaxRecursion, MaxFiles
      ArchiveMaxFileSize, ArchiveMaxRecursion, ArchiveMaxFiles,
      ArchiveMaxCompressionRatio, ArchiveBlockMax

  * clamscan:
    - NEW CMDLINE OPTIONS: --max-filesize, --max-scansize
    - REMOVED OPTIONS: --block-max, --max-space, --max-ratio

  * freshclam:
    - NEW CONFIG OPTION CompressLocalDatabase
    - NEW CMDLINE SWITCH --no-warnings
    - and directories are no longer used by ClamAV; please
      remove them manually from your database directory

The ClamAV team (


This is a bugfix release, please refer to the ChangeLog for a complete
list of changes.

The ClamAV team (


This release provides various bugfixes, optimisations and improvements
to the scanning engine. The new features include support for ARJ and
SFX-ARJ archives, AutoIt, basic SPF parser in clamav-milter (to reduce
phishing false-positives), faster scanning and others (see ChangeLog).
To get a consistent behaviour of the anti-phishing module on all platforms,
libclamav now includes the regex library from OpenBSD.

The ClamAV team (


This release fixes various bugs in libclamav, freshclam and clamav-milter,
and adds support for PUA (Potentially Unwanted Application) signatures
(clamscan: --detect-pua, clamd: DetectPUA).

** Announcement **

Dear ClamAV users,

On August 17, Sourcefire, the creators of Snort, acquired the ClamAV project.
The full announcement is available here:

We'd like to thank everyone in the ClamAV community for their dedication to
the project. The acquisition by Sourcefire is a testament to the hard work of
the entire ClamAV community in developing cutting edge technology that truly
showcases the promise of the open source model. With the additional resources
Sourcefire will provide we look forward to working with the community to
continue the advancement of ClamAV.

Sourcefire now owns ClamAV project and related trademarks, as well as the
source code copyrights held by the five principal members of the ClamAV team.
Sourcefire will also assume control of the ClamAV project including: the domain, web site and web site content; and the ClamAV Sourceforge
project page.

What's most important is that from the end-user perspective very little will
change beyond the additional resources Sourcefire will provide in our
continued efforts to advance the ClamAV technology and improve our ability to
interact with the open source community. The core team will continue to lead
the advancement of ClamAV and the CVD as employees of Sourcefire. Both the
ClamAV engine and the signature database will remain under GPL.

For more information please visit our website and the following FAQ page:

The ClamAV team (


This release fixes stability and other issues of 0.91.

The ClamAV team (


ClamAV 0.91 is the first release to enable the anti-phishing technology
in default builds. This technology combines heuristics with special
signatures and provides effective protection against phishing threats.
Other important changes and add-ons in this version include:

    - unpacker for NSIS (Nullsoft Scriptable Install System) self-extracting
    - unpacker for ASPack 2.12
    - new implementation of the Aho-Corasick pattern matcher providing
      better detection for wildcard enabled signatures
    - support for nibble matching and floating offsets
    - improved handling of .mdb files (fixes long startup times)
    - extraction of PE files embedded into other executables
    - better handling of PE & UPX
    - removed dependency on libcurl (improves stability)
    - libclamav.dll available under Windows
    - IPv6 support in clamav-milter
    - many other improvements and bugfixes

The ClamAV team (


This release fixes some security bugs in libclamav and improves stability
under Solaris. Please see ChangeLog for complete list of changes. 

If your system is suffering from long clamscan startup times, please
consider installing 0.91rc1 which is due to be released shortly
after 0.90.3.

The ClamAV team (


This release fixes many problems in libclamav and freshclam.

The ClamAV team (


This release includes various bugfixes and code enhancements. Please
see ChangeLog for complete list of changes.

** Important note **: please run 'ldconfig' after installing this version.

The ClamAV team (


The ClamAV team is proud to announce the long awaited ClamAV 0.90.
This version introduces lots of new interesting features and marks
a big step forward in the development of our antivirus engine.

The most important change is the introduction of scripted updates.
Instead of transferring the whole cvd file at each update, only the
differences between the latest cvds and the previous versions will be

In case the local copy of the latest cvd is corrupted or the scripted
update fails for some reason, freshclam will fallback to the old method.
Similarly to cvd files, scripted updates are compressed and digitally signed
and are already being distributed. They will dramatically reduce traffic on
our mirrors and will allow us to release even more updates in the future.

Another noticeable change is the new configuration syntax: you can now turn
single options on and off, the old crude hack of "DisableDefaultScanOptions"
is no longer required.

Cosmetic changes apart, the 0.9x series introduces lots of new code, but some
parts are not compiled in by default because they are not ready for production
systems yet. You are encouraged to pass the --enable-experimental flag to
./configure when compiling ClamAV. The experimental code introduces many
improvements in terms of detection rate and performances. If you find a bug,
please take some time to report it on our bugzilla:
Your help in testing the new code is really appreciated. The experimental code
introduces many improvements in terms of detection rate and performances. 

RAR3, SIS and SFX archives support is finally available together with 
new unpackers and decryptors: pespin, sue, yc, wwpack32, nspack, mew, upack
and others. Additionally, ClamAV now includes better mechanisms for scanning
ELF, PDF and tar files. The email decoding has been improved to reduce both
the memory requirements and the time taken to process attachments.

As part of the Google Summer of Code program, we have introduced support for
a new phishing signatures format that has proved very effective in detecting
phishing emails. The ClamAV phishing module allows better and more generic
detection of phishing emails by searching for URLs in email messages, and 
comparing the real site with the URL displayed to the user in the message. 

On the performance side, support for the MULTISCAN command has been 
implemented in clamd, allowing to scan multiple files simultaneously.
Support for Sensory Networks' NodalCore acceleration technology
( is now available in ClamAV and will be
compiled in if the ncore libraries are detected at compile time. NodalCore
acceleration allows highly improved scan speeds on systems equipped with
NodalCore cards.

Detailed list of changes:

-) libclamav:
  + New unpacker for RAR3, RAR2 and RAR1
  + Rewritten unpackers for Zip and CAB files
  + Support for RAR-SFX, Zip-SFX and CAB-SFX archives
  + New PE parsing model:
    - Accurate virtual and raw size and offset calculations
    - Proper parsing of executables with weird/handcrafted/uncommon headers
    - Proper handling (or skipping) of ghost sections at various places in the
    - Rebuild improvements for various unpackers
    - Adjusted alignment on rebuilt executables
    - Proper handling of out of sections offsets
    - Broken exe detection now mimics the XPSP2 loader
    - Lots of misc improvements and fixes
  + Support for PE32+ (64-bit) executables
  + Support for MD5 signatures based on PE sections (.mdb)
  + ELF file parser
  + Support for Sensory Networks' NodalCore hardware acceleration technology
  + Advanced phishing detection module (experimental)
  + Signatures are stored in separate trees depending on their target type
  + Algorithmic detection can be controlled with CL_SCAN_ALGORITHMIC
  + Support for new obfuscators: SUE, Y0da Cryptor, CryptFF
  + Support for new packers: NsPack, wwpack32, MEW, Upack
  + Support for SIS files (SymbianOS packages)
  + Support for PDF and RTF files
  + New encoding and entity normalizer (experimental)

-) clamd:
  + New config file parser:
    * all options require arguments (options without args must be now followed
      by boolean values: (yes, no), (1, 0), or (true, false)
    * optional arguments (as in NotifyClamd) are no longer supported
    * removed "DisableDefaultScanOptions" option (scan options can be
      configured individually)
  + TCP and local sockets can be operated simultaneously
  + New command: MULTISCAN (scan directory with multiple threads)
  + New option AlgorithmicDetection
  + New option ScanELF
  + New option NodalCoreAcceleration (requires hardware accelerator)
  + New option PhishingSignatures
  + New options to control the phishing module:
    - PhishingRestrictedScan
    - PhishingScanURLs
    - PhishingAlwaysBlockSSLMismatch
    - PhishingAlwaysBlockCloak

-) clamav-milter:
  + Black list mode: optionally black lists an IP for a configurable amount
    of time
  + Black hole mode: detects emails that will be discarded and refrains from
    scanning them
  + Reporting: ability to report phishing attempts to anti-phishing
    organisations to help close the sites
  + Improved load balancing for scanning with clusters
  + Removed -b option (enable BOUNCE compile time option to re-enable the

-) clamscan:
  + New options: --no-phishing-sigs, --no-algorithmic (disable phishing and
    algorithmic detection respectively)
  + New options to control the phishing module: --no-phishing-scan-urls,
    --no-phishing-restrictedscan, --phishing-ssl, --phishing-cloak
  + New option: --ncore (requires hardware accelerator)
  + New option: --no-elf
  + New option: --copy

-) freshclam:
  + Interpreter for .cdiff files (scripted updates)
  + Initial version of mirror manager
  + New option: --list-mirrors (list details on mirrors accessed by the mirror
  + New option HTTPUserAgent to force different User-Agent header

-) sigtool:
  + New option: --utf16-decode (decode UTF16 encoded files)
  + New options: --diff, --run-cdiff, --verify-cdiff (update script management)
  + New option: --mdb (generated .mdb compatible signatures)

-) clamconf: initial version of configuration utility for clamd and freshclam

We are happy to announce new interesting software with support for ClamAV:

  + AqMail - a POP3 client with additional filtering
  + ClamFS - a FUSE-based file system with on-access anti-virus scanning
  + c-icap - an ICAP server coded in C with support for ClamAV
  + MailCleaner - a complete email filtering gateway
  + mod_streamav - a ClamAV based antivirus filter for Apache 2
  + pyClamd - a python interface to Clamd

More information at

The ClamAV team (


This version improves scanning of mail and tar files.

The ClamAV team (


Changes in this release include better handling of network problems in
freshclam and other minor bugfixes.

The ClamAV developers encourage all users to give a try to the latest
beta version of 0.90!

The ClamAV team (


This version fixes a crash in the CHM unpacker and a heap overflow in the
function rebuilding PE files after unpacking.

The ClamAV team (


This release fixes a possible heap overflow in the UPX code.

See security information at:

The ClamAV team (


This version fixes handling of large binhex files and multiple alternatives in
virus signatures.

The ClamAV team (


This release improves virus detection, fixes zip handling on 64-bit
architectures and possible security problem in freshclam.

Following the 0.88.1 release some portals and security related websites
published incorrect information on security problems of 0.88. To avoid
such incidents in the future, every new ClamAV package will be released
together with detailed information about security bugs it fixes. Details
for this version can be found here:

The ClamAV team (


This version fixes a number of minor bugs and provides code updates
to improve virus detection.

The ClamAV team (


A possible heap overflow in the UPX code has been fixed. General improvements
include better zip and mail processing, and support for a self-protection mode.
The security of the UPX, FSG and Petite modules has been improved, too.

The ClamAV team (


This release includes major bugfixes for problems with handling TNEF
attachments, cabinet files and FSG compressed executables.

The ClamAV team (


This version fixes vulnerabilities in handling of UPX and FSG compressed
executables. Support for PE files, Zip and Cabinet archives has been improved
and other small bugfixes have been made. The new option "--on-outdated-execute"
allows freshclam to run a command when system reports a new engine version.

The ClamAV team (


Changes in this release include fixes for three possible integer overflows
in libclamav, improved scanning of Cabinet and FSG compressed files, better
database handling in clamav-milter, and others.

The ClamAV team (


A possible crash in the libmspack's Quantum decompressor has been fixed.

The ClamAV team (


This release introduces a number of bugfixes and cleanups. Possible descriptor
leaks in archive unpackers and mishandling of fast track uuencoded files have
been fixed in libclamav. Database reloading in clamav-milter has been improved.

The ClamAV team (


A problem where an email with more than one content-disposition type line,
one or more of which was empty, could crash libclamav has been fixed. Other
minor bugfixes have been made.

The ClamAV team (


Bugfixes in this release include correct signature offset calculation in large
files, proper handling of encrypted zip archives, and others.

The ClamAV team (


This version improves detection of JPEG (MS04-028) based exploits, introduces
support for TNEF files and new detection mechanisms. Various bugfixes
(including problems with scanning of digest mail files) and improvements
have been made.

** We encourage users to help testing the development versions, now with **
** rewritten RAR code and support for 3.0 archives!			 **
**			 **

-) libclamav:
    + JPEG exploit detector now also checks embedded Photoshop thumbnail images
    + archive meta-data scanner (improves malware detection within encrypted
    + support for TNEF (winmail.dat) decoding
    + support for all tar archive formats
    + MD5 implementation replaced with a slightly faster one
    + improved database reloading with reference counter
    + database updateable false positive eliminator
    + speed improvements
    + various bugfixes

-) clamd:
      environment variables

-) clamav-milter:
    + improved database update detection when not --external

-) clamscan:
    + new options --include-dir and exclude-dir
    + new option --max-dir-recursion

-) freshclam:
    + new directive LocalIPAddress

-) contrib:
    + clamdmon 1.0 - clamdwatch replacement written in C

-) 3rd party software:
    + hMailServer - open source e-mail server for Microsoft Window
    + pop3.proxy - proxy server for the POP3 protocol
    + HTTP Anti Virus Proxy
    + SmarterMail Filter - ClamAV based plugin for SmarterMail Mail Server
    + smf-clamd - small & fast virus filter for Sendmail
    + Squidclam - replacement for written in C
    + QtClamAVclient - remote clamd client based on the Qt Toolkit
    + qpsmtp - flexible smtpd daemon written in Perl


Palo Alto, Calif. March 31st 2005 - Clam AntiVirus, the leading Open Source
antivirus toolkit, and Sensory Networks, the leading provider of hardware
acceleration for network security applications, announced a partnership
to provide hardware acceleration support for the Clam AntiVirus suite.
Support for Sensory Networks' NodalCore acceleration in ClamAV will be
available in version 0.90 of the software suite in Q3 2005. For more
information please visit:

The ClamAV project announces the opening of the official merchandise store:

A big thank you to Finndesign ( which
volunteered to design the whole line of products, including:

- t-shirts (for women and men)
- golf shirt
- sweatshirt
- coffee mug
- mousepad
- stickers
- scrapbook

By purchasing our merchandise, you contribute to the development of ClamAV.

The ClamAV team (


Due to a high number of bad files produced by broken software, the MS05-002
exploit detector now only checks specific RIFF files. This version also fixes
a stability problem of clamav-milter/clamd and improves e-mail scanning.

The ClamAV team (


This release adds generic detection of MS05-002 ("Vulnerability in Cursor and
Icon Format Handling Could Allow Remote Code Execution") based exploits.
Fixes include correct attachment scanning in e-mails generated by some
Internet worms (broken in 0.81), removed false positive "Suspect.Zip"
warning on non-standard zip archives created by ICEOWS, better proxy support
in freshclam, and speed improvements.

The ClamAV team (


Scan engine improvements were made. The internal mail scanner now supports
multipart/partial messages, and support for decoding non-standard mail files
was greatly enhanced. clamav-milter by default uses libclamav and scans emails
itself without the use of clamd. libclamav can now extract RFC2397 encoded
data within HTML documents, block zip archives with modified information in
local header, and scan HQX files. PE file structure rebuilding from compressed
executables was improved.

Important note to clamdwatch users: please upgrade to the latest version
(contrib/clamdwatch) as soon as possible.

-) libclamav:
    + major improvements in the mail scanning engine:
	o support for multipart/partial messages
	o improved support for non-standard quoted-printable attachments
	o in some situations it will try to guess a correct mode (e.g.
	  a good type for an incorrect content-type, a best guess for an
	  unknown encoding type, etc.)
	o handling of RFC822 comments in the commands (e.g.: Co(foo)ntent-Type:
	o better recovery if memory softlimit is hit
	o new test code that decodes emails without parsing them first (must
	  be enabled manually before compilation)

    + support for extracting RFC2397 encoded data within HTML documents
    + blocking of zip archives with modified information in local header
    + improved PE structure rebuilding from compressed executables
    + improved support for zip archives
    + support for Mac's HQX file format
    + stability and (minor) security fixes
    + a lot of minor improvements, including support for new platforms

-) clamd:
    + new directive ExitOnOOM (stop the deamon when libclamav reports an out of
      memory condition)
    + new directives StreamMinPort and StreamMaxPort (port range specification
      for a stream mode)
    + support for passing of file descriptors

-) clamdscan:
    + added support for --move and --remove

-) clamav-milter:
    + by default uses libclamav to scan e-mails
    + new option --external (enables the use of clamd)
    + various optimisations

-) freshclam:
    + the DNS mode is now enabled by default (no need for DNSDatabaseInfo in
    + --no-dns uses a If-Modified-Since method instead of a range GET
    + added support for AllowSupplementaryGroups

-) sigtool:
    + new options --vba and --vba-hex (extract VBA/Word6 macros and optionally
      display the corresponding hex values; Word6 binary code will be

-) The list of third party programs with support for ClamAV is growing
   rapidly. Here are the latest additions (see clamdoc.pdf for details):

    + AVScan - a libclamav based GUI a-v scanner for Unix
    + clamailfilter - a Python script that provides a-v scanning via procmailrc
    + ClamAVPlugin - A ClamAV plugin for SpamAssassin 3.x
    + ClamCour - an e-mail filter for Courier
    + clamfilter - a small, secure, and efficient content filter for Postfix
    + ClamMail - an anti-virus POP3 proxy for Windows
    + ClamShell - a Java GUI for clamscan
    + ClamTk - a perl-tk GUI for ClamAV
    + clapf - a virus scanning and antispam content filter for Postfix
    + D bindings for ClamAV - ClamAV bindings for the D programming language
    + Frox - a transparent FTP proxy
    + KMail - a fully-featured email client now supports ClamAV out of box
    + Mail Avenger - a highly-configurable SMTP server with a-v support
    + Mailnees - a mail content filter for Sendmail and Postfix
    + Maverix - anti-spam and anti-virus solution for AOLServer
    + Moodle - scan files submitted by students for viruses!
    + php-clamav - scan files from within PHP
    + pymavis - a powerful email parser, similar to the old amavis-perl
    + QClam - a simple program to plug ClamAV to a qmail mailbox
    + qmailmrtg7 - display graphs of viruses found by ClamAV
    + qSheff - an e-mail filter for qmail
    + SafeSquid - a feature rich content filtering internet proxy
    + Scrubber - a server-side daemon for filtering mail content
    + simscan - an e-mail and spam filter for qmail
    + smtpfilter - scan SMTP session for viruses
    + snort-inline - scan your network traffic for viruses with ClamAV
    + SquidClamAV Redirector - a Squid helper script which adds virus scanning 
    + WRAVLib - a library for a-v integration with Mono/.NET applications

The ClamAV team (


Stable version. Please read the release notes for the candidate versions below.

The ClamAV team (


Improvements in this release include better JPEG exploit verification,
faster base64 decoding, support for GNU tar files, updated on-access scanner,
and others.

The ClamAV team (


This release candidate eliminates possible false positive alerts in UPX/FSG
compressed files and clarifies behaviour of default actions in clamd and

We encourage users to take advantage of our new mirror structure. In order to
download the database from the closest mirror you should configure freshclam
to use where XY is your country code (see for the full list). Please add
the following lines to freshclam.conf:


DNSDatabaseInfo enables database and software version verification through
DNS TXT records, and the second database mirror acts as a fallback in case
a connection to the first mirror fails for some reason.


This update fixes a serious bug in e-mail scanner.


The development version of ClamAV is ready for general testing! New mechanisms
have already proved very nasty to Internet worms successfully protecting
against the new versions R, S, T, U, V and W of the infamous Mydoom worm
and detecting them as Worm.Mydoom.Gen before they were analysed and specific
signatures added by the ClamAV database maintainers. That means servers running
the new version of ClamAV have detected and blocked 100% of Mydoom attacks!

New features in this release include:

-) libclamav
    + Portable Executable analyser (CL_SCAN_PE) featuring:
	o UPX decompression (all versions)
	o Petite decompression (2.x)
	o FSG decompression (1.3, 1.31, 1.33)
	o detection of broken executables (CL_SCAN_BLOCKBROKEN)
    + new, memory efficient, pattern matching algorithm (multipattern variant
      of Boyer-Moore) - it's now primary matcher and Aho-Corasick is only used
      for regular expression extended signatures
    + new signature format with advanced target type and offset specification
    + support for MD5 based signatures
    + extended regular expression scanner
    + added support for MS cabinet files
    + added support for CHM files
    + added support for POSIX tar archives
    + scanning inside PowerPoint documents
    + HTML normaliser with support for decoding of MS Script Encoder code
    + great improvements in e-mail scanner (now handles even more worm tricks)
    + new method of mail files detection
    + all e-mail attachments are now scanned (previously only the first ten
      attachments were scanned)
    + added support for scanning URLs in e-mails (CL_SCAN_MAILURL)
    + detection of Worm.Mydoom.M.log
    + updated API (still backward compatible but please consult clamdoc.pdf
      (Section 6) and adapt your software)

-) clamd
    + new directive ScanHTML (enables HTML normalisator and ScrEnc decoder)
    + new directive ScanPE (win32 executable analyser and decompressor)
    + new directive DetectBrokenExecutables (try to detect broken executables
      and mark them as Broken.Executable)
    + new directive MailFollowURLs (try to download and scan files from URLs
    + new directive ArchiveBlockMax (archives that exceed limits will be
      marked as viruses)
    + clamav.conf was renamed clamd.conf

-) clamscan
    + mail files are scanned by default, use --no-mail to disable it
    + new option --no-html (disables HTML normalisator)
    + new option --no-pe (disables PE analyser)
    + new option --detect-broken
    + new option --block-max
    + new option --mail-follow-urls (download and scan files from URLs in mails)

-) clamdscan
    + now prints warnings if some activated command line options are only
      supported by clamscan
    + added support for archive scanning in stdin mode

-) clamav-milter
    + improved template file format
    + quarantined file names now contain virus names
    + initial support for SESSION mode of clamd

-) freshclam:
    + new directive DNSDatabaseInfo that enables ultra lightweight version
      verification method through DNS (using TXT records). Based on idea by
      Christopher X. Candreva and enabled by default.
    + new option --no-dns (quick option to disable DNS method without editing

-) sigtool
    + removed ability of automatic signature generation (use MD5 sums to
      create your own signatures, see signatures.pdf for details)
    + new option --md5
    + new option --html-normalise (saves HTML normalisation and decryption
      results in three html files in current directory)

-) configure:
    + new option --disable-gethostbyname_r (try enabling it if clamav-milter
      compilation fails)
    + new option --disable-dns (try enabling it if freshclam compilation fails)
    + extended regular expression scanner

-) documentation
    + included new Mac OS X installation instructions
    + official documentation rewritten and outdated docs removed

-) new 3rd party software with support for ClamAV:
    + OdeiaVir - an e-mail filter for qmail and Exim
    + ClamSMTP - a lightweight (written in C) and simple filter for Postfix
    + Protea AntiVirus Tools - a virus filter for Lotus Domino
    + PTSMail Utilities - an e-mail filter for Sendmail
    + mxGuard for IMail - a mail filter for Ipswitch IMail (W32)
    + Zabit - a content and attachment filter for qmail
    + BeClam - ClamAV port for BeOS
    + clamXav - a virus scanner with GUI for Mac OS X

Special thanks to aCaB for his work on UPX, FSG and Petite decompressors.

Thanks to good reaction times on new threats ClamAV was awarded as best
security tool for 2004 by Linux Journal: "...With this year's outbreak of
e-mail worms for non-Linux platforms, ClamAV has been getting quite a workout,
and Linux admins on mailing lists report that database update times are keeping
up with or beating the proprietary alternatives." Thanks! is selling some very nice t-shirts and polo shirts powered by
ClamAV. Wear them and virus writers will stay away from you :-) A quarter out
of every dollar profited from the sale of these shirts will go to the ClamAV
project. Visit and click on ClamAV logo! 

The ClamAV team (


This release fixes detection of e-mails generated by Worm.Mydoom.I.

Important notice for people using ClamAV 0.60:

Our logs show that there is still a small percentage of ClamAV 0.60
installations updating their database. ClamAV 0.60 was released on
July 29th, 2003 and it was the last release to use the old database
format. Starting from version 0.65, released on November 12nd, ClamAV
uses a new database format, which is compressed and digitally signed.
We have been distributing the database in both formats till now, but
we plan to drop support for ClamAV 0.60 on September 1st.

We encourage _all_ users to upgrade to the latest release available.
People running an old version of ClamAV are missing many viruses and 
may experience stability problems.

On non-production systems you can try the latest development version.
The new engine not only speeds up the scanning process but also limits
memory usage by about 8 MB ! It's able to scan new formats, including
CAB, CHM, UPX, HTML (normalisation), PowerPoint macros and can detect
annoying e-mails with empty attachments generated by new Bagle variants.

The ClamAV team (


Bugfixes in this version include crashes with multipart/mixed messages
and corrupted OLE2 and Zip files. Improvements include various optimisations
of mail scanning and clamav-milter and clamdscan behaviour.

New members of our "3rd party software" list:

    + MyClamMailFilter	    an e-mail filter for procmail (written in C)
    + clamaktion	    scan files from the right-click Konqueror menu
    + QMVC		    Qmail Mail and Virus Control
    + pyclamav		    Python binding for ClamAV
    + FETCAV		    Front End To Clam AntiVirus based on Xdialog
    + Famuko		    an on-access scanner working in a userspace
    + SoftlabsAV	    a generic anti-virus filter for procmail

Japanese users can take an advantage of the new ClamAV related site:
and join the clamav-jp-users mailing list.

The ClamAV team (


This version fixes memory management problems in the OLE2 decoder and
improves mail scanning. Because of the rapid ClamAV development the team
encourages users to help in testing new features:

Thank you for using ClamAV !

The ClamAV team (


Major bugfixes in this release include crashes with corrupted BinHex messages
and some Excel documents. Protection against archive bombs (not fully
functional since 0.70) was improved and a number of other improvements were

The ClamAV team (


This release fixes all bugs found in 0.70 and introduces a few new features -
the noteworthy changes include:

-) libclamav:
    + support nested OLE2 files 
    + support Word6 macro code
    + ignore popular file types (media, graphics)
    + support compress.exe (SZDD) compression (test/test.msc)
    + improve virus detection in e-mails

-) clamscan:
    + automatically decide (by comparing daily.cvd version numbers) which
      database directory (hardcoded or clamav.conf's one) to use
    + support compression ratio feature (--max-ratio)
    + allow regular expressions in --[in|ex]clude
    + do not overwrite old files in a quarantine directory but add a numerical
      extension to new files
    + respect --tempdir in libclamav
    + fix access problem when calling external unpackers in a superuser mode
    + fix file permission corruption with --deb in a superuser mode

-) clamd
    + support log facility specification in syslog's style (LogFacility)
    + new directive LeaveTemporaryFiles (Debug no longer leaves temporary
      files not removed)

-) clamav-milter:
    + include the virus name in the 550 rejection
    + support user defined template for virus notifications (--template-file)
    + sort quarantine messages by date
    + improve thread management
    + add X-Virus-Scanned and X-Infected-Received-From: headers
    + improve load balancing (when using remote servers with --server)
    + send 554 after DATA received, not 550
    + save PID (--pidfile)

-) documentation:
    + German clamdoc.pdf translation (Rupert Roesler-Schmidt and Karina
      Schwarz, uplink coherent solutions,
    + new Japanese documentation (Masaki Ogawa)

The ClamAV team (


The two major changes in this version are new thread manager in clamd
and support for decoding MS Office VBA macros. Both of them have been
implemented by Trog. Besides, there are many improvements and bugfixes
(all listed in ChangeLog), a short summary:

-) clamd
    + new thread manager (with better SMP support)
    + on-access scanning now also available on FreeBSD (with Dazuko 2.0)
    + new directive ArchiveBlockEncrypted
    + new directive ReadTimeout (replaces ThreadTimeout)
    + handle SIGHUP (re-open logfile) and SIGUSR2 (reload database)
    + respect TCPAddr in stream scanner

-) clamav-milter:
    + TCPWrappers support

-) libclamav:
    + support MS Office documents (OLE2) and VBA macro decoding
    + support encrypted archive detection
    + new flags: CL_OLE2, CL_ENCRYPTED (see clamdoc.pdf, Section 6.1)
    + improve virus detection in big files
    + improve support for multipart, bounce and embedded RFC822 messages
    + improve RAR support
    + include backup snprintf implementation

-) clamscan:
    + new option: --block-encrypted

-) freshclam
    + new option: --pid, -p (write pid file if run as daemon)
    + handle SIGHUP (re-open logfile), SIGTERM (terminate with log message),
      SIGALRM and SIGUSR1 (wake up and check mirror)
    + fix bug with -u and -c handling

-) contrib
    + windows clamd client now available with source code

-) documentation:
    + new Polish documentation on ClamAV and Samba integration
    + official documentation updated

Special thanks to Dirk Mueller <mueller*> for his code review,
many bugfixes and cleanups.

Thanks to the help of many companies (clamdoc.pdf: Section 2.10, we have 49 very fast and reliable
virus database mirrors in 22 regions and the number is still growing.
As of March 2004 we attempt to redirect our users to the closest pool
of mirrors by looking at their ip source address when they try to resolve Our DNS servers can answer with a CNAME to:,, or Our advanced push-mirroring mechanism (maintained by
Luca Gibelli) allows database maintainers to update all the mirrors in less
than one minute !

There will be no major feature enhancements in the 0.7x series. Our work
will be concentrated on a new scanning engine and preliminary heuristics -
please help us and test CVS snapshots from time to time.

We are happy to announce new programs with support for ClamAV (all of them
have been reviewed by our team - more info in the documentation and
on our website:

    + ClamWin - a GUI for Windows (!)
    + KlamAV - a collection of GUI tools for using ClamAV on KDE
    + clamscan-procfilter - a Perl procmail filter
    + j-chkmail - a powerful filter for sendmail
    + qscanq - Virus Scanning for Qmail
    + clamavr - a Ruby binding for ClamAV
    + DansGuardian Anti-Virus Plugin
    + Viralator - a Perl script that virus scans http downloads
    + ClamAssassin - a filter for procmail
    + Gadoyanvirus - a filter for Qmail
    + OpenProtect - a complete e-mail protection solution
    + RevolSys SMTP kit for Postfix - an antispam/antivirus tools installation
    + POP3 Virus Scanner Daemon
    + mailman-clamav - a virus filter for Mailman
    + wbmclamav - a webmin module to manage ClamAV
    + Scan Log Analyzer
    + mailgraph - a RRDtool frontend for Postfix Statistics
    + INSERT - a security toolkit on a credit card size CD
    + Local Area Security - a Live CD Linux distribution

The ClamAV team (
April 17, 2004

Fixed RAR support.

This version fixes a crash with some RAR archives generated by the Bagle worm,
also a few important fixes have been backported from CVS.

We strongly encourage users to install the 0.70-rc version (released today).

This release fixes a memory management problem (platform dependent; can lead
to a DoS attack) with messages that only have attachments (reported by Oliver
Brandmueller). It also contains patches for a few problems found in 0.66 and
has better Cygwin support.

This version is a response to the "clamav 0.65 remote DOS exploit" information
published on popular security-related mailing lists. Unfortunately we had
not been contacted by the author before he published that and had to release
this (unplanned) package very quickly (it should be mentioned that CVS version
was not vulnerable to the exploit). Untested code has been disabled also
the Dazuko support is temporarily not available (if you really need it please
use a CVS version or wait for a next stable release). Other noteworthy changes:

-) clamd:
    + fixed database timestamp handling (and a double reload problem reported
      by Alex Pleiner and Ole Stanstrup)
    + new directive: ArchiveMaxCompressionRatio
    + new command: SESSION (starts a clamd session and allows to do multiple
      commands per TCP session)
    + new directives: TemporaryDirectory, LogClean (Andrey V. Malyshev)

-) clamav-milter: (Nigel Horne)
    + added support for AllowSupplementaryGroups and ThreadTimeout
    + added --quarantine-dir (thanks to Michael Dankov)
    + added --noreject (thanks to Vijay Sarvepalli)
    + added --headers (thanks Leonid Zeitlin)
    + added --sign option

-) libclamav:
    + detect Worm.SCO.A bounces (Nigel)
    + prevent buffer overflow in broken uuencoded files (Nigel)
    + scan multipart alternatives that have no boundaries (Nigel)
    + better handling of encapsulated messages (Nigel)
    + locate uuencoded viruses hidden in text portions of multipart/mixed
      mime messages (Nigel)
    + initial support for BinHex (Nigel)
    + fixed a mail recursion loop (problem reported by Alex Kah and Kristof
    + fixed bzip2 memory limit (improper call suggested by the buggy libbz2
      documentation, problem reported by Tomasz Klim)
    + fixed on error descriptor leak in CVD unpacker (Thomas Lamy)
    + fixed memory leak in digital signature verification code (Thomas Lamy)
    + added maximal compression ratio limit (cl_limits->maxratio)

-) clamscan:
    + support for multiple arguments on command line (Thomas Lamy)
    + fixed buffer overflow in --move (Denis De Messemacker)
    + removed support for sendfile() under Linux

-) freshclam:
    + support for freshclam.conf (that may be optionally merged with
      clamav.conf, command line options overwrite config settings)
    + work-around for potential database downgrade (subtle problem
      in r-r dns handling) - reported by Daniel Mario Vega and patched
      by Luca Gibelli

-) sigtool:
    + list virus names with --list-sigs (-l)

-) contrib:
    + clamdwatch (by Mike Cathey)
    + windows clamd client with drag&drop support (Nigel Horne)

-) documentation:
    + complete clamdoc.pdf French translation by Stephane Jeannenot
    + Polish how-to on ClamAV and Sendmail integration (with clamav-milter)
      by Przemyslaw Holowczyc


ClamAV was the first anti-virus protecting against Worm.SCO.A (aka MyDoom.A) !
The signature was published by Diego d'Ambra in the daily update 105,
26-Jan-2004 20:23 GMT and we were at least two hours faster than "big" AV

clamav-devel is finally able to decode OLE2 (Microsoft Office) files and
decompress VBA streams ! The code is developed by Trog, official ClamAV
developer. Also we're testing new clamd implementation that will solve
several important problems (especially that "Time out" related). Please
help us and test the latest CVS version.

The virus database now contains more than 20.000 signatures ! On January 8,
Denis De Messemacker (who joined our team 3 months ago) added signatures for
about 7700 new viruses. Also special thanks go to Tomasz Papszun for his
hard work on daily submissions and forcing us to keep ClamAV quality on
the highest possible level.

New mirroring mechanisms. Luca Gibelli (ClamAV) and mirror administrators
(22 sites,, please see clamdoc.pdf for
a complete mirror information) are converting mirrors to new "push mirroring"
method. It uses advanced techniques to ensure all the mirrors are up to date.
More info:

"Newsworthy Hack of Kindness" - is featuring ClamAV in its latest
newsletter (Volume #9, January 2004:
Affero is a great rate-donate system and its mission is to bring a culture
of patronage to the Internet. Currently we only accept donations via Affero.
You can also help us and promote our project by adding the ClamAV logo to
your home page. Look at for more information.

We would like to thank our donors:

    * Jeremy Garcia (
    * Andries Filmer (
    * David Eriksson (
    * Dynamic Network Services, Inc (
    * epublica
    * Invisik Corporation (
    * Keith (
    * Explido Software USA Inc. (
    * cheahch from Singapore
    * Electric Embers
    * Stephane Rault
    * Brad Koehn
    * David Farrick
    * Inc. (
    * An anonymous donor from Colorado, US

Tomasz Kojm <tkojm*>
February 10, 2004

IMPORTANT NOTE: The project has been moved into SourceForge. The only official
		ClamAV's homepage is (however clamav.elektrapro.
		com still works). We would like to thank for
		their support for the open-source community  - THANKS !

ClamAV 0.65 introduces a new database container file format (called CVD) with
support for digital signatures and compression. Please remove the old
databases from your database directory before the installation. And the most
important thing: clamd stability has been greatly improved (especially under
FreeBSD) ! Also we have a new mirror infrastructure - you will find all the
details in clamdoc.pdf. If you want to become an official ClamAV mirror
(with entry in please read the clamav-mirror-howto.pdf
document and contact our administrator - Luca Gibelli <nervous*>.

Noteworthy changes in this version:

-) clamd:
    + fixed a race condition in database reloading code (random crashes
      under high load)
    + fixed a race condition with the improperly initialized session start time
      (thanks to Michael Dankov)
    + fixed PidFile permissions (Magnus Ekdahl, bug reported by Tomasz Papszun)
    + fixed LogFile permissions (Magnus Ekdahl)
    + new directive ScanRAR (bacause RAR support is now disabled by default)
    + new directive VirusEvent
    + new directive FixStaleSocket (Thomas Lamy and Mark Mielke)
    + new directive TCPAddr (Bernard Quatermass, fixed by Damien Curtain)
    + new directive Debug

-) clamav-milter: (Nigel Horne <njh*>)
    + new --force-scan flag
    + new -P and -q flags by Nicholas M. Kirsch
    WARNING: clamav-milter and our mail scanner are still in high development
	     and may be unstable. You should always use the CVS version.

-) libclamav:
    + support for a new database container format (CVD) - compressed and
      digitally signed
    + better protection against malformed zip archives (such as Mimail)
    + mail decoder fixes (thanks to Rene Bellora, Bernd Kuhls, Thomas Lamy,
      Tomasz Papszun) (Nigel Horne)
    + memory leak fixes (Thomas Lamy)
    + new scan option CL_DISABLERAR (disables built-in RAR unpacker)

-) freshclam:
    + fixed --on-error-execute behaviour (David Woakes)
    + new option --user (-u) USER - run as USER instead of the default user.
      Patch by Damien Curtain.
    + rewritten to use and CVD

-) documentation:
    + new Spanish documentation on ClamAV and Sendmail integration by
      Erick Ivaan Lopez Carreon
    + included clamdoc.pdf Turkish translation by yavuz kaya and Ýbrahim erken
    + included clamav-mirror-howto.pdf by Luca Gibelli
    + included clamd+daemontools HOWTO by Jesse D. Guardiani
    + included signatures.pdf
    + man pages: updated
    + clamdoc.pdf: rewritten

New members of our list of ClamAV certified software (see clamdoc.pdf for
    + cgpav
    + smtp-vilter
    + IVS Milter
    + scanexi
    + Mail::ClamAV
    + OpenAntiVirus samba-vscan
    + Sylpheed Claws
    + nclamd

Thanks to Mia Kalenius and Sergei Pronin we have a new official logo !

Thank you for using ClamAV !

Tomasz Kojm <tkojm*>
November 12, 2003


Hello again...

This is a new, (very?) stable release of Clam AntiVirus. 0.60 was developed
and stabilized for over seven months and many people had contributed to the
final release. This version introduces many enhancements and a new program:
clamav-milter written by ClamAV developer Nigel Horne. This is a mail scanner
for Sendmail/milter written entirely in C, which uses clamd for virus scanning.
Clamav-milter and clamd duet is a powerful solution for systems where high
performance is required. Please check clamdoc for more detail.

    Many people get confused with ClamAV database status because of
    the OpenAntiVirus update information at:
    (last update at 17 October, 2002). The ClamAV virus database contains
    the OAV database (with some signatures fixed or removed) but we
    develop it independently of the OAV project. Our database is updated
    frequently (on average 4-5 times a week). You can help (or join) us -
    will find some basic but useful instructions at

News from ClamAV world:

-) New email address for virus submitting:
   You don't need to encrypt a virus sample, but if your system doesn't allow
   you to send infected files just put it into an encrypted zip archive
   (password: virus)

   Special thanks to Nicholas Chua, Diego D'Ambra, Hrvoje Habjanic, Nigel Kukard
   and Chris van Meerendonk for a big number of samples submitted.

-) New mailing list:
   After each update an email with subject "[clamav-virusdb] Update" and a list
   of viruses added is sent to it. You can set up a procmail rule for freshclam
   to react on such a mails (and update the database just after an update).

-) New official mirrors:
    + database mirror updated manually (thanks to
      Andrew <>)
    + full (automatic) mirror of
      (thanks to Chris van Meerendonk <>)
    + database mirror - rsync from
      (thanks to Douglas J Hunley <>)

    Freshclam will automatically use them when the main server is not

-) Official port in FreeBSD available ! (maintained by Masahiro Teramoto

-) Unofficial port for OpenBSD is available at:
   (maintained by Flinn Mueller <>)

-) there are many new programs that use ClamAV, eg. mod_clamav (Apache
   virus scanning filter), clamdmail or Sagator. You will find more
   info in clamdoc.


-) libclamav:
    + fixed buffer overflow in unrarlib (patch by Robbert Kouprie

    + various mbox code updates (fixed memory leak; added support for decoding
      viruses sent in message bodies, detection of viruses that put their
      payloads after the end of message marker (thanks to Stephen White
      <> for the bug report and useful CGI tools); 

    + zziplib updated to 0.10.81 (some problems with older version were reported
      by Martin Schitter)
    + direct scanning of mbox/maildir files (new directive CL_MAIL)
    + file scanner optimization (patch by Hendrik Muhs
    + bzip2 support
    + faster detection of malformed Zip archives (eg. 'Zip of Death'), they are
      reported as a viruses
    + fixed strcasecmp() compile problem in zziplib on Free/NetBSD and others

-) clamd:
    + fixed descriptor leak in directory scanner - it was causing random
      clamd crashes and locks, especially on highly loaded servers. Reported
      by Kristof Petr <>.

    + fixed crash with archive scanning on BSD (increased thread stack size)
      (Nigel Horne)
    + fixed CONTSCAN command (used by clamdscan) - it had archive support
      disabled (hardcoded)
    + fixed SelfCheck option (there was a logic bug, and the option was
      disabled) it now checks a databases time stamps and reloads them
      if needed.
    + fixed possible writing to undefined descriptors (bug found by
      Brian May <>)
    + new STREAM command (scanning data on socket) and directives:
      StreamSaveToDisk (save stream to disk to allow scanning within archives),
      StreamMaxLength. This option allows scanning data on socket (might be
      sent from another host), currently only clamav-milter uses this.

    + new ScanMail directive for scanning into mbox/Maildir files
    + new directive: ArchiveLimitMemoryUsage (limit memory usage with bzip2)
    + new directive: AllowSupplementaryGroups (feature requested by Exiscan
    + syslog support (LogSyslog) (patch by Hrvoje Habjanic
    + fixed parser segfault with extra space between option and argument
      in config file (Magnus Ekdahl <>)

-) clamscan:
    + fixed --remove option (didn't work when the file was scanned with an
      internal unpacker) (patch by Damien Curtain <>)
    + --move option for moving infected files into a specified directory
      (by Damien Curtain <>)
    + --mbox enables a direct support for mbox files
      (ex. clamscan --mbox /var/spool/mail)
    + fixed --log (-l) option
    + fixed -i option (patch by Magnus Ekdahl <>)
    + enabled default archive limits (max-files = 500, max-size = 10M,
      max-recursion = 5)
    + use arj instead of non-free unarj (patch by Magnus Ekdahl)
    + use unzoo instead of non-free zoo (patch by Magnus Ekdahl)
    + removed thread support

    + mirror support (implemented by Damien Curtain <>)
    + --proxy-user: proxy authorization support (implemented by Gernot Tenchio
    + new options --on-error-execute, --on-update-execute
      (ex. freshclam -d -c 6 --on-error-execute "sendsms 23332243 Can't
      update virus database"). Idea by Douglas J Hunley <>

    + --disable-cr (don't link with C reentrant library (needed on some newer
      versions of OpenBSD))

-) Enhanced AIX (thanks to Mike Loewen <>) and
   Tru64 support (thanks to Christophe Varoqui <>)

-) documentation:
    + included how-to in Portugese by Alexandre de Jesus Marcolino
    + clamdoc.pdf and system manual updates

Many thanks to Luca 'NERvOus' Gibelli from ElektraPro for his support,
to Ken McKittrick from USA DataNet for a fully accessible FreeBSD box and
to mailing list subscribers for a constructive discussions.

Tomasz Kojm
June 21, 2003

Many major changes this time...

-) libclamav:
    + fixed segfault with some strange zip archives (there is a bug in zziplib,
      libclamav contains a work around for it) (the problem was reported by
      Oliver Paukstadt <>)
    + engine improvements (better support for a detection of new viruses,
      limited memory usage (consumes ~ 5 Mb now))
    + mbox code updated and moved into the library: fixed core dump when an
      embedded message includes a mime header with the line Content-Type:
      without specifying the type of content, fixed (theoretical) memory leak,
      support for multipart/report messages, fixed bug causing some formats to
      fail to scan) (Nigel)
-) clamd:
    + new commands: CONTSCAN (it doesn't stop scanning even when virus is
      found), VERSION
    + disable logging of a unnecessary time stamps with LogTime when
      LogVerbose isn't used (patch by Ed Phillips <ed@UDel.Edu>)
-) freshclam:
    + "Cache-Control: no-cache" enabled by default
    + Cygwin support fix
-) clamdscan:
    + initial version
-) all tools:
    + removed huge printf() in help() (there was a buffer overflow problem with
      --help option under Windows and SCO Unix (reported by Wojciech Noworyta
      <> and Nigel respectively)
-) configure:
    + allow configuration of the clamav user and group with --with-user and
      --with-group (patch by Patrick Bihan-Faou <>)
    + --enable-id-check - it uses the check procedure from Jason Englander
      <>, currently it will fail on systems with getent
      which doesn't detect clamav group.
    + do not overwrite the existing config file

There are initial packages for Windows available at:


This release has removed the limit for a file name length in clamscan. Some
viruses (eg. W32/Yaha.E) are using very long file names, and they were
ignored in mbox mode. Users of AMaViS-ng and other wrappers were not
vulnerable to this problem, because that programs don't use original
attachement file names.

-) clamscan:
    + removed limit for a file name length (thanks to Odhiambo Washington
      <> for the test files and extensive mbox testing)
    + mbox: adapted to the new changes, enabled thread support (Nigel),
	    re-enabled temporary directory removing.


This version contains a portability fixes - it should compile on OpenBSD,
MacOSX and NetBSD (support for them was broken in 0.51). 

-) clamd: various fixes:
	+ drop supplementary groups (suggested by Enrico Scholz
	  <>) (this has been implemented
	  in freshclam, too)
	+ work-around for the segmentation fault at QUIT under FreeBSD
	+ check timeouts when waiting for threads in RELOAD mode
	+ SelfCheck - internal integrity check (by default every 1 hour)
	+ fixed problem with directory scanning on non typical file systems
	  (bug reported by Jason Englander <>)
	+ clamd is a system command (clamd.1 -> clamd.8, /usr/local/bin ->
	  /usr/local/sbin) (Magnus Ekdahl)
-) clamscan:
	+ mbox code updates (Nigel Horne) - it fixes some problems on *BSD
	  systems (see mailing lists archives for the details)
	+ enable core dumping (Nigel Horne) [ with --enable-debug ]
-) freshclam:
	+ applied http-proxy patch from (by
	  Martin Lesser <>)
	+ when configured with --disable-cache, freshclam forces 'no-cache'
	  option in proxy servers (patch by Ant La Porte <>)

-) HPUX (10.20/11.0 tested) support (thanks to Joe Oaks <>)
-) fixed support for SCO Unix and BeOS (Nigel Horne)
-) support/mboxscan: new version with SpamAssassin support (Nigel Horne)
-) re-included TrashScan 0.08 (by Trashware <>) - the security
   issue has been fixed.
-) included "Installing qmail-scanner, Clam Antivirus and SpamAssassin under
   FreeBSD" how-to by Paul Hoadley and Eric Parsonage


OAV database is up to date ! There was a problem with signature parsing,
because some hex strings were upper case. Anyway, I still recommend you
freshclam for a database updating.

-) support for the genuine OAV database
-) limited memory usage (at the cost of speed, increase CL_MIN_LENGTH in
   libclamav/clamav.h to make it faster, it's safe to set it on 3-4 for
   the OAV database)
-) fixed compile problem on TurboLinux 6.5 (probably others, too), the bug
   was reported by Henk Kuipers <>.
-) clamd: fixed THREXIT (thanks to Piotr Gackiewicz <>)
-) clamd: fixed serious bug with thread argument type
-) clamscan: mbox: don't scan empty attachments (Nigel Horne)
-) configure: --with-db1, --with-db2 (suggested by Magnus Ekdahl)


Here it is...
Clam AntiVirus 0.50 contains an anti-virus library - libclamav, a fully
multi-threaded daemon clamd(1) and a quite long list of changes. The
documentation was rewritten and you _should_ review it. By courtesy of
NERvOus <> and ElektraPro, there are three mailing lists
available - you can subscribe via www at
Please check the manual for more information.

New software:

-) libclamav with RAR, Zip and Gzip support built-in. The library is thread
   safe and should be very secure, also. It uses UniquE RAR File
   Library by Christian Scheurer and Johannes Winkelmann (RAR 2.0 support only)
   and zziplib library by Guido Draheim and Tomi Ollila. Both of them are
   included and slightly modified in the clamav sources. You need the zlib
   library for the Zip/Gzip support, though. The API is described with
   examples in the clamdoc.

-) clamd: a modern anti-virus daemon. It uses configuration file clamav.conf
   described in the clamav.conf(5) manual. The program was written with
   security as a goal. 

-) clamuko: on-access scanning under Linux. It utilizes Dazuko kernel module
   (GPL, and is clamd-based.

New features / improvements:

-) enhanced scanner engine (better detection of some complex polymorphic

-) clamscan: Nigel Horne <> has added the ability to scan
   mail attachments in a filter. For example:

   $ clamscan -i --mbox - < /var/spool/mail/john
   /tmp/aa6b9fc06bc477ae/setup.exe: Worm/Klez.H FOUND

   Nigel is the author of the whole mbox code in clamscan. Currently it only
   works in a filter mode, but there are plans to move the code into the
   libclamav and allow clamd using it. Please check support/mboxscan, also.

-) clamscan: support for including and excluding multiple patterns with
   --include and --exclude (patch by Alejandro Dubrovsky
   Example: clamscan --include .exe --include .obj --include .scr /mnt/windows

-) clamscan: don't scan /proc files (Linux, st_dev comparing). No more
   /proc/kcore related mails :))

-) clamscan: use libclamav's archive support by default (it's enabled by default
   and may be disabled with --disable-archive) and switch to the external
   unpackers (if specified) in the case of libclamav archive code error.

-) freshclam: proxy support (via $http_proxy variable and --http-proxy).
   I started implementing proxy support some time ago, but never finished.
   Nigel Horne did the great job and has finished the proxy support !

-) freshclam: --daemon-notify. freshclam will send the RELOAD command to the
   daemon after database update (supports both tcp and local sockets, it reads
   clamav.conf to determine the socket type).

-) freshclam: support for viruses.db2

Bug fixes:

-) freshclam: log 'Database updated' message (thanks to Jeffrey Moskot
    <> for the bug report). It now prints a number
    of signatures in a database, also.

-) clamscan: fixed compile problem on Solaris 8 and some other systems -
   #include <signal.h> lack in others.c (thanks Mike Loewen
   <> for the bug report)


-) included Japanese documentation by Masaki Ogawa <>

-) updated Spanish "Sendmail + Amavis + ClamAv - Como" by Erick I. Lopez
   Carreon <>

-) rewritten clamdoc, included clamdoc-html, removed PostScript version (.ps)

-) Clam-Mutant ;) logo update by Michal Hajduczenia <>

-) new man pages: clamd(1), clamav.conf(5); others updated

    Please don't use the oav-update script with this version. It doesn't
update viruses.db2 and supports site only (the last
update of the OAV database was 1 July !). Nicholas Chua <>
has generated over 200 new signatures, ClamAV's database is also frequently
updated (expecially when new wild virus/worm appears, eg. W32/BugBear.A).

    This software is still in developement (new software == new bugs), however
clamscan should be very stable. You shouldn't use clamd/clamuko (well, clamd is
stable, clamuko isn't) on production systems, yet. Please wait for 0.51 at
least ;). ClamAV 0.50 was tested on Linux and Solaris and should work fine.
There is a problem with clamd on FreeBSD (tested on my FreeBSD 5.0-CURRENT) -
the daemon crashes with Zip/Gzip files (disabling ScanArchive should help).

Enjoy !
Tomasz Kojm
October 5, 2002


-) fixed threads deadlock in a critical error situation (bug found by David
   Sanchez <>)
-) fixed sigtool bug (negative seeking)
-) fixed potential clamscan segfault in the case of memory allocation error
-) unpacker execution error is no longer treated as critical - a few programs
   (eg. Qmail-Scanner, TrashScan) have clamscan command hardcoded with all
   archive options turned on. Now, if unpacker can't be executed, raw file is
   scanned and scan process is continued.
-) reverted to pthread.h detection
-) TrashScan 0.07 (Trashware <>)
-) --exclude (regular expressions are not supported !)
   [ex: clamscan --exclude="/proc/kcore" /], but please use it with care.
-) included html documentation

You will probably have a problem with a default Qmail-Scanner (1.13 or newer)
installation. You need to increase qmail-smtpd softlimit or disable it. You
can force clamscan to use only half of the memory which it uses by default, too.
Please change the following line in the clamscan/matcher.h file:
    #define MIN_LENGTH 5
    #define MIN_LENGTH 3
and recompile the program. Unhappily, scanning may be a little slower in some
cases, but it shouldn't be significant. Then you can safely set the qmail
softlimit to 8 MB. I want to thank Doug Monroe <> for
his contribution in the problem analysis.

New ClamAV version is in a heavy development. It has currently built-in
support for RAR, Zip, Gzip and tar. The daemon will support only built-in
compression/archive support. Snapshot will be available for a few days.


-) fixed compile problem on FreeBSD (thanks to Wieslaw Glod <> and
   Ken McKittrick <>)
-) clamscan reads all .db files from data directory, so you can put your
   own databases there and they won't be overwrited by the updaters. viruses.db
   is still the main database file (if --database isn't used).
-) --deb (debian binary packages scanning) by Magnus Ekdahl <>
-) --remove option, but be careful with it !
-) new clam logo ;) (GPL) by Michal Hajduczenia <>.
-) TrashScan 0.06 (by Trashware <>) - a script for scanning
   mail with procmail. I recommend it. (support/trashscan)
-) documentation updates

0.30 release will contain a daemon and an anti-virus library (with simple API),
so you can use it directly in your projects. I want to build in zip and rar
support, also.

There are binary packages for AIX available. Please check the documentation.


This release fixes bug with scanning archives in unaccessible directories with
*superuser* priviledges (after dropping priviledges scanner wasn't able to
access the archive, although the same archive was accessible), thanks
for Sergei Pronin <> for the problem description. Now all
archives unaccessible directly by the clamav user are copied (with a respect to
--max-space) to the temporary directory. All old filesystem tricks were removed.

Other fixes / improvements:

-) better error handling, new error codes
-) improved -i (--infected) option
-) removed --strange-unzip option
-) removed eicar test files and logos from the documentation due to the GPL
   (thanks for Magnus Ekdahl <>), ClamAV-Test-Signature is
   used instead
-) removed Qmail-Scanner patch, ClamAV is supported by Q-S 1.13 (thanks guys!)
-) code cleanups

0.21 Release

It fixes following problems:

-) database downloading in freshclam/0.20
-) malformed amavis-perl patch from 0.20
-) clamscan problems with some unzip versions, please try --strange-unzip

ClamAV 0.21 source package contains initial support for NetBSD
(thanks to Marc Baudoin <>, Jean-Edouard BABIN
<>), better support for Mac OS X (Masaki Ogawa <>),
and clamdoc documentation corrected by Dennis Leeuw <>.

0.20 Release

The most important change in this release is a new, linear pattern matching
algorithm. You will find more informations about it in clamscan/matcher.c -
in the sources and in clamdoc. Summary (since 0.15):

New features:

-) fast pattern matching algorithm
-) sigtool utility, check `man sigtool` and clamdoc
-) Linux: threads autodetection on various architectures
          (Magnus Ekdahl <>)
-) -i, --infected: clamscan prints only infected files
-) 'Data scanned' in summary, size in megabytes with 16 Kb precision
-) configure: --with-dbdir sets the database location
-) support/sigmake shell script by Dennis Leeuw <>
-) Spanish "Sendmail+Amavis+ClamAv installation how-to" by
   Erick I. Lopez Carreon <>


-) "Debian GNU/Linux Mail Server v. 0.2.0" by Dennis Leeuw <>
-) qmail-scanner patch from Kazuhiko <>
-) general documentation cleanups / updates
-) freshclam / Internet database location


-) threads autodetection on not-x86 Linux systems
-) gcc 3.x support (David Ford <>)
-) data type fix on Mac OS X (Peter N Lewis <>)
-) removed -w, --whole-file, now clamscan scans whole files by default
   -w is still supported by internal getopt(), because it is used in
   various patches
-) removed --one-virus, still supported by getopt(); removed 'Found viruses'
   from summary, clamscan stops file scanning after first virus
-) fixed old problem with scanning stdin
-) removed amavisd-patch - strange problems have been reported

OpenAntiVirus Update is a great tool written by Matthew A. Grant
<> and it will be the primary updater for ClamAV
in the near future. In contrast to freshclam it has proxy support and many
specific features. Please check clamdoc for more informations and how to
obtain it.

0.15 Notes

This version contains minor bugfixes only, such as:
    -) multiple fixes in freshclam (it has problems, when one of the
       hosts wasn't accessible), there were logic flaws in the code
    -) fixed problem with password protected archives (unpackers were waiting
       for password)

New features:
    -) OpenBSD support (thanks to Kamil Andrusz <>)
    -) added support for amavisd, qmail-scanner (see ./support)

There were no major bugs and I was very busy, that's why new version is
released just today. In the next 2 months, clamav development will be much
faster. Here are some of my plans:

    ~ 0.20 : New pattern-matching algorithm
    ~ 0.30 : clamlib; clamscan and the daemon based on it

There is a new homepage:

Thanks to for sponsoring this site (it's very fast).
Thanks to NERvOus <>.

If you are interested in current development versions, please check
snapshots link.

Resource usage limits in 0.14

Two new features: --max-files, --max-space have been implemented. If you have
enabled one of this options, clamscan monitors resource usage (number of
created files and used space) and stops extractor when it has exceeded
the limit. You should use these options to protect your machine against
Denial of Service attacks. In the near future --max-levels (limit for
recursive archives extracting) and --max-time (spent on checking/extracting
files) will be implemented.

FreeBSD: AMaViS compile problems

Please check FAQ.

!!! Strange signatures in !!!

Last version of signatures was ~90 kb, this version is ~474 kb.
But I don't understand, why some signatures are mega-huge. When I decoded
them, they looked like regular files. In CA they were removed from the
database and I probably add them later, in normal sizes.

Installation :

Please view documentation in ./docs. There are several formats - pdf, ps
and plain latex, if you want to compile it yourself.

You need GNU make (on Solaris you should have gmake).
It was tested only with gcc 2.9x compilers.