Email-Worm:MSIL/Agent.MXK

Classification

Malware

Email-Worm

MSIL

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 move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

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.