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Virus:Worm/Sohanad.Gen.12
Date discovered:16/02/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:686.837 Bytes
MD5 checksum:caef53b90aaf824a35444c75069ecc67
VDF version:7.10.08.215
IVDF version:7.11.03.121 - Wednesday, February 16, 2011

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Troj/AutoIt-JO
   •  Bitdefender: Trojan.Autoit.ANO
   •  Panda: Trj/Keylogger.ABH
     GData: Trojan.Autoit.ANO


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • C:\Win\lsass.exe
   • %drive%\lsass.exe



The following files are created:

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

C:\Win\names.txt



It tries to execute the following files:

Filename:
   • explorer.exe %malware execution directory%


Filename:
   • c:\Win\lsass.exe

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "run32"="C:\Win\lsass.exe"



The following registry key is changed:

[HKCU\Software\Microsoft\Internet Explorer\Toolbar]
   New value:
   • "Locked"=dword:0x00000001

 Injection – It injects a backdoor routine into a process.

    Process name:
   • explorer.exe


 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 Thursday, April 14, 2011
Description updated by Petre Galan on Thursday, April 14, 2011

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