Free protection against viruses and worms software for linux

F-Prot Antivirus security software package has various components that help keep your system secure from viruses, backdoors, trojans and other malicious programs. The project includes the RealTime Protector, a memory-resident monitoring utility that observes all files accessed on your system, a Scheduler where you can set the Scanner to make automatic scans or updates on your system at any time and an Updater to manage all signature updates.
For home users using the Linux open-source operating system, we offer F-Prot Antivirus for Linux Workstations. F-Prot Antivirus for Linux Workstations utilizes the renowned F-Prot Antivirus scanning engine for primary scan but has in addition to that a system of internal heuristics devised to search for unknown viruses
F-Prot Antivirus for Linux was especially developed to effectively eradicate viruses threatening workstations running Linux. It provides full protection against macro viruses and other forms of malicious software - including Trojans.
Main features:
- Scans for over 191534 known viruses and their variants
- Ability to perform scheduled scans when used with the cron utility
- Scans hard drives, CD-ROMS, diskettes, network drives, directories and specific files
- Scans for images of boot sector viruses, macro viruses and Trojan Horses
F-Prot Antivirus for Linux Workstations is FREE for use by personal users on personal workstations

The Horde Application Framework is written in PHP, and provides the common tools a Web application requires: classes for dealing with preferences, compression, browser detection, connection tracking, MIME, and more.
The Horde Framework does not provide any significant end user functionality and it provides a base for other applications and tools for developers. You will probably want to install some of the available Horde applications, such as IMP (a webmail client), or Kronolith (a calendar).
Enhancements:
- This is a security release that fixes a cross site scripting vulnerability and improves protection against phishing attempts.

Corbicula Anti Virus is a GNOME HIG compliant front end for ClamAV.

Corbicula Anti Virus tries to be the simplest possible anti virus application, without any fancy features who nobody uses anyway...

About AVG Anti-Virus:

• AVG Professional Single Edition is perfectly designed to give you the maximum antivirus protection for your single home PC or workstation.
• It is simple to install and operate. No IT expertise is required and it can run in the background, providing uninterrupted protection. All file and e-mail activity is checked automatically, allowing you to get on with your work without worrying about viruses.
• It is extremely fast, reliable and light on resources, so, no matter how demanding a user you are, it will not slow down your performance.

Enhancements: Added detection of new variants of trojans SHeur2.ANNO, BackDoor.Hupigon5.LCW, SHeur2.ANOR, Downloader.Generic8.AXOI, PSW.Banker5.ONF, Generic13.BPUS.

F-Prot GUI is a graphical user interface for great (and free for individual users) command line antivirus called F-Prot.
F-Prot GUI is a very simple script but not featureless, I hope it will be useful.
For home users using the Linux open-source operating system, we offer F-Prot Antivirus for Linux Workstations. F-Prot Antivirus for Linux Workstations utilizes the renowned F-Prot Antivirus scanning engine for primary scan but has in addition to that a system of internal heuristics devised to search for unknown viruses
F-Prot Antivirus for Linux was especially developed to effectively eradicate viruses threatening workstations running Linux. It provides full protection against macro viruses and other forms of malicious software - including Trojans.
Main features:
- Scans for over 314168 known viruses and their variants
- Ability to perform scheduled scans when used with the cron utility
- Scans hard drives, CD-ROMS, diskettes, network drives, directories and specific files
- Scans for images of boot sector viruses, macro viruses and Trojan Horses

Milter-virus is not a virus scanner. It is a wrapper that can be used with many commercial and freely available virus scanners. Milter-Virust is written completely in C, and requires (few skills??).
It is run-able with the Milter interface, but then will only scan for "double extensions".
If you wish it to scan for more, you need at Ripmime or other tools to extract files from MIME-encoded emails. You also need a (command-line) virus scanner.
The difference between this program and the original is that this is much more configurable via the config file. The original version has the advantage that it is simpler and easier to bugfix.
Enhancements:
- This is a large update.
- Many problems in the statistik module were fixed.
- Some spam protection features were included.

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

Your computer has been invaded! Dozens of little viruses are pouring in via security holes in Microsoft Internet Explorer, Microsoft Outlook, Microsoft MSN Messenger and Microsoft Recycle Bin!!
Using your trusty mouse you must shoot the buggers before they can destroy your files! Some will steal them from their home directories and take them back to their security hole.
Others will just eat them right there on the spot! See how long you and your computer can survive the onslaught!
Main features:
- 3 different virus types.
- Builds directories and files to protect based on your computer!
- Increasing difficulty level
- Highscore table
- 3 difficulty settings