Threat description




This is a large family of related viruses. Many of them were reported to be in the wild in France in December 1995 - February 1996. Most of the WereWolf viruses are resident infectors of COM and EXE files.


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Technical Details

WereWolf is a stealth virus, but it will only stealth the change in file sizes. Virus is not encrypted and contains the following text:


WereWolf avoids infecting the following programs:

CLEAN - McAfee CLEAN         AVP   - Antiviral Toolkit Pro         TB    - ThunderByte Antivirus         QB    - QBasic         SCAN  - McAfee SCAN         COMM  - Many communication programs         NAV   - Norton Antivirus         V     - Anything starting with a 'V'         FINDV - S&S Findvirus         GUARD - S&S VirusGuard         FV    - S&S Findvirus         CHKDS - DOS CHKDSK         F-PR  - F-PROT         -D    - AVP TSR  


This polymorphic variant got widespread distribution in April 1996, as it was attached to a shareware game called 'PackMan', which was available in the upload directory of a major shareware ftp server. This variant has been found in the wild in several countries.

Werewolf.1500.B corrupts data randomly and slowsly while it is being written to the hard drive by any other program. Such changes are very difficult to locate and repair afterwards.

Werewolf.1500.B contains this text:


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