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Email-Worm:MSIL/Agent.MXK

Classification

Category: Malware

Type: Email-Worm

Platform: MSIL

Aliases: Email-Worm:MSIL/Agent.MXK

Summary


A worm that spreads via email, usually in infected executable email file attachments.

Removal


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details


Email-Worm:MSIL/Agent.MXK attempts to spread using several different methods (email, autorun, P2P and network-worm). It will also try to connect to an IRC-channel to get further instructions that include stealing CD-keys for several different games or performing a DOS attack.

Execution

When executed, the worm copies itself to:

  • %temp%\svchost.exe
  • %windir%\system32\drivers\tmpp.exe

Creates the following launchpoint so that the worm is executed when the infected system is started:

  • HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon Userinit = C:\WINDOWS\SYSTEM32\Userinit.exe,C:\Documents and Settings\user\Local Settings\Temp\svchost.exe

Creates two distinct mutexes among others

  • yourmothersucks
  • AVanalyststfu

Miscellaneous functionality:

  • disables System Restore
  • disables Windows Firewall
  • disables Vista User Access Control
  • disables Task Manager
  • disables registry tools
  • Explorer will no longer show file extensions
  • Explorer will no longer show hidden files

The worm will attempt to join the channel #botland1 on irc.afterworkchat.net to receive instructions from the attacker. The command include retrieving keys for the following games:

  • Star Wars Battlefront 2.0
  • Mount And Blade
  • Battlefield 2
  • Company Of Heroes
  • Supreme Commander
  • Battlefield 1942
  • Command and Conquer Generals Zero Hour
  • The Sims 3
  • Call of Duty
  • Call of Duty2
  • Call of Duty4
  • Call of Duty WAW
  • CounterStrike
Propagation

Spreads as an autorun worm using the file name ntldr.com.

Spreads as an email worm faking the sender address to the name of the Windows user account and uses one of the following domain names:

  • %username%@gmail.com
  • %username%@hotmail.com
  • %username%@live.com
  • %username%@hotmail.de
  • %username%@live.de
  • %username%@fbi.gov
  • %username%@msn.com
  • %username%@yahoo.com

emails will be sent to addresses in the Outlook address book. The subject of the email will be "Hi" and the mail body will be "WoW, WTF?!"

The worm will try to copy itself to other computers on the network by trying to guess the username and password using a short list of different common passwords (e.g., 123, root, admin).

The worm will copy itself to the shared folder of several different file-sharing applications, affected programs are:

  • eDonkey2000
  • eMule
  • gnucleus
  • grokster
  • KaZaa Lite
  • KaZaa
  • Morpheus

The following are the file names that the worm may use:

  • windows_vista.rar
  • virusgen.rar
  • wormgenerator.rar
Notes

The worm is not very stable and probably in many cases, only the first steps of copying the file to the two locations, and creating registry keys are successfully performed.