Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:
  • file viruses
  • boot sector viruses
  • macro viruses
  • script viruses
Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Virus

Viruses replicate on the resources of the local machine. Unlike worms, viruses do not use network services to propagate or penetrate other computers. A copy of a virus will reach remote computers only if the infected object is, for some reason unrelated to the virus function, activated on another computer. For example: when infecting accessible disks, a virus penetrates a file located on a network resource a virus copies itself to a removable storage device or infects a file on a removable device a user sends an email with an infected attachment.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.


Technical Details

It is a dangerous nonmemory resident parasitic polymorphic Win32 virus. It infects the PE EXE files (Win32 executable). The virus infection routine has bugs and most of infected files are corrupted. They cannot be repaired and should be restored from not infected source.

On 1st of months with even numbers (February, April, June,...) the virus runs its payload routine that creates 500 garbage files with random names in three directories: Windows directory, Windows system directory and in the root directory on the drive where Windows is installed.

When infection routine is activated, the virus searches for PE EXE files in the current directory, then encrypts its body and writes to the end of the file. To get control on infected files start the virus patches the victim files' entry routine - the virus overwrites it with polymorphic code that passes control to the decryption routine in the main virus code (at the end of the file).

The virus checks file names and does not infect anti-virus programs: SCAN*, DRWE*, PAVW*, AVP3*, AVP1*, NOD3*, NOD. The virus also deletes the ANTI-VIR.DAT file, if it exists.

The virus contains the text string:

LethalMind.Champagne releaseed the 22th of March 1999.
Greetings to 29A, SLAM, Darkman, Benny, Pockets, Rod, Mist,
Thermo, Mdrg and all who have helped me. Je t'aime Laurence !

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