P2P-Worm.Win32.Gotorm

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: P2P-Worm

P2P Worms spread via peer-to-peer file sharing networks (such as Kazaa, Grokster, EDonkey, FastTrack, Gnutella, etc.). Most of these worms work in a relative simple way: in order to get onto a P2P network, all the worm has to do is copy itself to the file sharing directory, which is usually on a local machine. The P2P network does the rest: when a file search is conducted, it informs remote users of the file and provides services making it possible to download the file from the infected computer. There are also more complex P2P-Worms that imitate the network protocol of a specific file sharing system and responds positively to search queries; a copy of the P2P-Worm is offered as a match.

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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 Worm virus. It spreads through the peer-to-peer network Kazaa. Additionally, it performs some spying functions, gathering data on certain games installed on the affected PC. This worm is a Windows application (PE EXE-file). It is written in Visual C, and its size is 196 608 bytes.

Installation

During installation the worm produces the following false error message concerning the archive extraction:

Subsequently it writes itself into the Windows directory under the following name:

mrowyekdc.exe

This installation of the worm is then registered in the auto run key within the system registry:

 HKLMSoftwareMicrosoftWindowsCurrentVersionRun
  SVCHOST = %WindowsDir%mrowyekdc.exe

Spreading

The worm creates a folder named "User Files" in the Windows directory and writes itself into it under the following names:

Starcraft + Broodwar 1.10 map hack.exe
Starcraft + Broodwar 1.10 no-cd hack.exe
Diablo 2 map hack.exe
Diablo 2 no-cd hack.exe
Jamella's Diablo 2 hero editor.exe
Warcraft 3 map hack.exe
Warcraft 3 stat hack.exe
Warcraft 3 no-cd hack.exe
Warcraft 3 Frozen Throne map hack.exe
Warcraft 3 Frozen Throne cd-cd hack.exe
The Frozen Throne map hack.exe
Counterstrike hacks.exe
Counterstrike aim hack.exe

This folder is then noted in the Windows system registry as Local Content for the file exchange network Kazaa:

 HKCUSoftwareKazaaLocalContent
  dir0 = 012345:%Windir%User Files
  DisableSharing = "0

As a result, the files contained in this folder become available for download to other users of P2P networks.

Spy function

The worm checks the system registry for keys relating to popular computer games (Counter Strike, Diablo, Warcraft, Starcraft) and sends gathered data to the worm's "owner" using an SMTP-server connection.

Miscellaneous

The worm checks the system's date and time. If the month of the worm's activation is earlier than August it ceases performing its functions and deletes all its entries in the system registry.

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