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Date discovered:14/11/2006
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:85.304 Bytes
MD5 checksum:b33fd2986984b06065b21712d6385b9a
VDF version: - Tuesday, November 14, 2006
IVDF version: - Tuesday, November 14, 2006

 General Methods of propagation:
   • Autorun feature
   • Messenger

   •  Kaspersky: Trojan.Win32.Menti.glsd
   •  Bitdefender: Trojan.Generic.KD.227298
   •  GData: Trojan.Generic.KD.227298
   •  DrWeb: Trojan.Packed.21648

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

Side effects:
   • Third party control
   • Drops malicious files
   • Registry modification
   • Steals information

 Files It copies itself to the following locations:
   • %drive%\RECYCLER\Cwtstu.exe
   • %HOME%\Application Data\Cwtstu.exe

It deletes the initially executed copy of itself.

The following file is created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

It tries to execute the following file:

– Filename:
   • %HOME%\Application Data\Cwtstu.exe

 Registry The following registry key is added in order to run the process after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Cwtstu"="%HOME%\Application Data\Cwtstu.exe"

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

– Windows Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

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

Server: ng.the**********.com
Port: 3800

Server: ng.mar**********.com
Port: 3800

Server: ng.gra**********.com
Port: 3800

Server: ng.lig**********.com
Port: 3800

Server: ng.coa**********.com
Port: 3800

 Stealing It tries to steal the following information:
– Passwords typed into 'password input fields'

– A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:
   • **login.asp*; *secure.logmein.*/*logincheck*;
      *megaupload.*/*login; *fileserve.*/login*; *;
      *.alertpay.*/*login.aspx; *.moneybookers.*/*;
      *runescape*/*weblogin*; *dyndns*/account*; *steampowered*/login*;
      *hackforums.*/member.php; *facebook.*/login.php*;
      **/*login*; **/*post.srf*; *gmx.*/*FormLogin*;
      *fastmail.*/mail/*; *bigstring.*/*index.php*;
      **/login.psp*; *aol.*/*login.psp*;
      *google.*/*ServiceLoginAuth*; *paypal.*/webscr?cmd=_login-submit*

 Injection – It injects itself as a remote thread into a process.

It is injected into all processes.

 Miscellaneous Accesses internet resources:
   • http://api.wip**********.com/

It creates the following Mutex:
   • djQPssJO4SAQzkgw

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

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Tuesday, July 5, 2011
Description updated by Petre Galan on Tuesday, July 5, 2011

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