Virus.Win32.Donut

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.

Description

Technical Details

This is a harmless parasitic Win32 virus. It consists of two parts: the virus itself written in assembly language, and the payload written in MSIL.

The virus searches for Win32 PE EXE .NET applications. It infects files in up to 20 upper level directories.

While infecting, the virus writes itself to the end of the file, then the virus writes its payload instead of the original host's metadata, which is moved down. When an infected file is launched, the virus creates a copy of the infected file, restores its metadata and launches it.

The original content of infected files is able to work only in Windows 2000. When an infected file is launched in Windows XP, the virus will still work, but the host file won't launch.

Depending of the random counter (in 1 in 10 cases), the virus displays the following message box:

 ________________________________________________
 I.NET.dotNET by Benny/29A                       I
 I_______________________________________________I
 IThis cell has been infected by dotNET virus!   I
 I_______________________________________________I 

The virus body contains the text string:

This cell has been infected by dotNET virus!

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