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Email-Worm:MSIL/Agent.MXK

First posted on 15 January 2010.
Source: SecurityHome

Aliases :

There are no other names known for Email-Worm:MSIL/Agent.MXK.

Explanation :

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

Additional DetailsEmail-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.

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 on autorun worm using the file name ntldr.com

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

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.

Last update 15 January 2010

 

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