Threat description




A worm that spreads via e-mail, usually in infected executable e-mail file attachments.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect 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 (e-mail, 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.


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 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

Spreads as an autorun worm using the file name

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


E-mails will be sent to addresses in the Outlook address book. The subject of the e-mail 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

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.

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