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Virus:Worm/Agent.83968
Date discovered:10/07/2009
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:83.968 Bytes
MD5 checksum:45043f2c55f3566b2ad967c79a9e918c
IVDF version:7.01.04.216 - Friday, July 10, 2009

 General Aliases:
   •  Panda: W32/Koobface.JU.worm
   •  Eset: Win32/Koobface.NCK
   •  Bitdefender: Worm.Generic.226254


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


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %WINDIR%\sber20.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %malware execution directory%\sd.dat
   • %WINDIR%\dxxdv34567.bat
   • c:\3.reg



The following files are created:

– c:\3.reg This is a non malicious text file with the following content:
   • %code that runs malware%

%malware execution directory%\sd.dat
%WINDIR%\dxxdv34567.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
%WINDIR%\bx4657.dat



It tries to download a file:

– The locations are the following:
   • http://themasterengraver.com/**********/?action=%character string%&v=%number%
   • http://starart.net/**********/?action=%character string%&v=%number%
   • http://somhittat.se/**********/?action=%character string%&v=%number%
   • http://www.gecahe.com/**********/?action=%character string%&v=%number%




It tries to executes the following files:

– Filename:
   • %WINDIR%\sber20.exe


– Filename:
   • cmd /c %WINDIR%\dxxdv34567.bat


– Filename:
   • regedit /s c:\2.reg

 Registry The following registry key is added:

– [HKCR\Mime\Database\Content Type\application/xhtml+xml]
   • "CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
   • "Encoding"=hex:08,00,00,00
   • "Extension"=".xml"

 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • http://www.google.com

 File details 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 Wednesday, April 7, 2010
Description updated by Petre Galan on Wednesday, April 7, 2010

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