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Virus:TR/Ircbrute.A.791
Date discovered:08/09/2010
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:135.168 Bytes
MD5 checksum:A98DC68388D2199E85078AA3D4A58AC9
VDF version:7.10.05.13
IVDF version:7.10.11.109 - Wednesday, September 8, 2010

 General Method of propagation:
    Messenger


Aliases:
   •  TrendMicro: TROJ_IRCBRUTE.DH
   •  Sophos: Mal/Behav-103
     Avast: Win32:Ruskill-AL [Trj]


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
    Windows Vista
    Windows 7


Side effects:
   • Third party control
   • Drops files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following location:
   • %APPDATA%\E-73473-3674-74335\msnrsmsn.exe

 Registry One of the following values is added in order to run the process after reboot:

  [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft MainUpdates"="%APPDATA%\E-73473-3674-74335\msnrsmsn.exe"



It creates the following entry in order to bypass the Windows XP firewall:

[HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%APPDATA%\E-73473-3674-74335\msnrsmsn.exe"="%APPDATA%\E-73473-3674-74335\msnrsmsn.exe:*:Enabled:Microsoft
      MainUpdates"

 Messenger It is spreading via Messenger. The characteristics are described below:

 Yahoo Messenger


Message
The sent message looks like one of the following:

   • ahoj, dobry den jste na? ... %link%
     belas fotos nao de voce %link%
     Fotograflarinizi?? %link%
     hey, beautiful facebook photos.. %link%
     hoi niet mooi fotos %link%
     hoj so vase fotografije? %link%
     ich sag nur geile fotos. %link%
     muy hermosas fotos no?? %link%
     u lepo slike ne? ... %link%
     u velmi pekne fotografie od vas? %link%
     uh flotte fotos fra dig %link%
     uh szep kepek rolad %link%
     uh valokuva ei ole? %link%
     uh vos facebook photos? %link%
     uhh, ladne zdjecia z was. %link%
     vackra bilder fran dig %link%
     vakre bilder fra deg. %link%
     woow, imagini frumoase din voi?? %link%
     wow le tue foto bellissime %link%
     wow, fbphotos. %link%

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: **********m.hoodrich.ru
Port: 4042
Nickname: %random character string%


 Furthermore it has the ability to perform actions such as:
     connect to IRC server
     disconnect from IRC server
    • Join IRC channel
    • Leave IRC channel

 File details Programming language:
The malware program was written in MS Visual C++.

Description inserted by Andrei Ilie on Wednesday, September 21, 2011
Description updated by Andrei Ilie on Thursday, September 22, 2011

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