Remove W32.Simouk

Posted on: May 30th, 2009


Discovered: May 22, 2009
Updated:

May 22, 2009 10:03:15 PM

Type:

Trojan

Systems Affected:

Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Vista, Windows XP

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Technical Details:

When the virus is executed, it creates one of the following files for every file it infects:

* %CurrentFolder%\[INFECTED FILE NAME].url
* %CurrentFolder%\[INFECTED FILE NAME].msi

It then infects executable files found on the compromised computer by encrypting and moving 32,768 bytes of the host executable data into a separate file with the name [INFECTED FILE NAME].url in the current directory. It then writes itself into the first 28,672 bytes of the host file.

When an infected file is executed, it looks for the following file:
%CurrentFolder%\[INFECTED FILE NAME].url

It then copies the current file [INFECTED FILE NAME].exe to [INFECTED FILE NAME].exe.lnk.

It reads the [INFECTED FILE NAME].url file and decodes the encrypted host file, writing it to [INFECTED FILE NAME].exe.lnk.

It then launches the file in an attempt to disguise itself.

It then connects to a remote host and once connected it attempts to download any of the following items:

* Additional configuration file
* Additional malware
* An updated version of itself

Note: The remote host may be the following domain:
easycf.51.net

Action Steps:
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