Free antivirus programs software for linux

AntiVirus Scanner is an anti-virus scanner for Endeavour Mark II that uses the ClamAV library (libclamav).

AntiVirus Scanner allows you to create a list of scan items for frequently scanned locations and features easy virus database updating, all in a simple GUI environment.

Programs Bar is a programs launcher bar theme for SuperKaramba.

Was tested on Mandriva 2006 and Fedora Core 5.

The Qmail virus scanner (QScan) is a mail filter for Qmail that scans incoming messages using the Sophos Antivirus engine, immediately rejecting infected content.

It is designed to be minimalistic, yet extremely fast and secure, and uses multiple pipes instead of the traditional temporary files and privilege separation. It works with non-native versions of the virus scanner like under OpenBSD with Linux or FreeBSD emulation.


You must create a temporary directory to extract MIME attachments, and replace Qmails original qmail-queue program with Qscan. Quick way to achieve this for the impatients :

mkdir /var/qmail/qscan
chmod 700 /var/qmail/qscan
chown qmaild:qmail /var/qmail/qscan
ln /var/qmail/bin/qmail-queue /var/qmail/bin/qmail-queue-old

Now, lets compile and install Qscan :

./configure --help

./configure [your beloved flags]

make install-strip

The last step is to replace the original qmail-queue program with our filter :

rm /var/qmail/bin/qmail-queue
ln -s /usr/local/sbin/qscan /var/qmail/bin/qmail-queue

Depending on your local configuration, it may be needed or not, but start with doing it :

chown qmaild:qmail /usr/local/sbin/qscan
chmod 6711 /usr/local/sbin/qscan

After testing, if everythings ok for you, remove the setuid bit :

chown 0:0 /usr/local/sbin/qscan
chmod 711 /usr/local/sbin/qscan

Yet Another antiVirus Recipe is a procmail that helps to filter out a lot of the most common e-mail worms.
For some of the above (plain iframe, clsid, xml, macro) e-mail is delivered normally but gets a WARNING in subject plus its old subject ($SUB).
Some of the warnings are:
WARNING-XML-CODEBASE-OBJECT-$SUB
WARNING-CLSID-EXTENSION-$SUB
WARNING-IFRAME-$SUB
WARNING-MACRO-$SUB
WARNING-NSCAM-SCORE:$NKNGS-$SUB
Main features:
- :: base64 signatures ::
- Most of these worms are MS-Windows executables and arrive at our e-mail encoded through base64 routines. YAVR uses especially selected signatures to locate these attachments. After that it places them in a directory (/virus/) sorted by name.
-
- :: iframe html exploit ::
- Through IFrame tag a html encoded e-mail can download and execute a file from a remote http site without informing the user.
-
- :: CLSID hidden extensions exploit ::
- Attachments which end with a Class ID (CLSID) file extension do not show the actual file extension saved and viewed with Windows Explorer. This allows dangerous file types to look as though they are actually innocent files, such as JPG or WAV files.
-
- :: xml codebase exploit ::
- Usage of some xml objects allow local files to be automatically executed, regardless of the security settings on the target machine.
-
- :: generic executable trap for bat, pif, vbs, vba, scr, lnk, com, exe ::
- The rest of MS-executable files that are not caught from base64 signatures end up in a virus-could-be file.
-
- :: generic macro detection for doc,dot,xls,xla files ::
- MS-Word and MS-Excel files that contain macro commands are marked with a warning.
-
- :: generic detection for most of nigeria scam e-mails (most of them) ::
- Nigeria scam e-mail is not a virus but a big spam problem... There are many good filters that use great algorithms for spam. This is just an add-on.
Enhancements:
- new switches for quarantine or not certain e-mailsbased on some ideas by Dan Smart
- YAVRQUARANTEXE if set to ON it sends unknown executables to /virus/virus-could-be as usual if set to OFF it delivers at inbox with a warning (and the X- header ;)
- YAVRQUARANTNIG same for nigeria scam
- YAVRQUARANTPRN same for porn e-mail read instuctions inside nkvir-rc
- X- marks in headers to help your own procmail scripts
- X-YAVR: MS-EXEC (any MS executable that wasnt identified by signatures)
- X-YAVR: NIGERIA (nigeria scam)
- X-YAVR: PORN (porn related)
- X-YAVR: MACRO (containing macro code)
- X-YAVR: XML-CODEBASE
- X-YAVR: IFRAME
- X-YAVR: CLSID-EXTENSION
- X-YAVR: SENDMAIL-EXPLOIT
- some more Worm.Moodown.b aka Netsky.b signatures
- another Mimail.Q