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Virus:Worm/Koobface.csb
Date discovered:30/11/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:56.320 Bytes
MD5 checksum:7543b53db465a6f2a21c669dac1bbf7c
IVDF version:7.10.01.125 - Monday, November 30, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.v
   •  Panda: W32/Koobface.FL.worm
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Worm.Generic.103172


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%\freddy75.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • C:\vx\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%

%WINDIR%\dxxdv34567.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
%malware execution directory%\sd.dat
%WINDIR%\bk23567.dat



It tries to download a file:

– The locations are the following:
   • http://juanfurlan.com.ar/**********/?action=fbgen&mode=s&age=93&a=544453496&v=75&ie=%character string%
   • http://eurorot.com/**********/?action=fbgen&v=75
   • http://bchampion.com/**********/?action=fbgen&v=75
   • http://crescenthorizons.com/**********/?action=fbgen&v=75
   • http://hillsdemocrat.com/**********/?action=fbgen&v=75
   • http://nationalauto1.com/**********/?action=fbgen&v=75
   • http://www.pwsd1pc.org/**********/?action=fbgen&v=75
   • http://dexteracreations.com/**********/?action=fbgen&v=75
   • http://aya-multimedia.co.cc/**********/?action=fbgen&v=75
   • http://onestopfloorshop.com/**********/?action=fbgen&v=75
   • http://icelkumbasar.com/**********/?action=fbgen&v=75
   • http://www.redcode.rs/**********/?action=fbgen&v=75
   • http://dglbahamassc.com/**********/?action=fbgen&v=75
   • http://www.folcon-mex.com/**********/?action=fbgen&v=75
   • http://davedolbin.com/**********/?action=fbgen&v=75
   • http://static.e-lady.pl/**********/?action=fbgen&v=75
   • http://starart.net/**********/?action=fbgen&v=75
   • http://www.ecole-de-boucq.org/**********/?action=fbgen&v=75
   • http://juanfurlan.com.ar/**********/?action=fbgen&v=75
   • http://panoramapics.com/**********/?action=fbgen&v=75
   • http://wellingtontractorparts.com/**********/?action=fbgen&v=75
   • http://www.gwypg.co.uk/**********/?action=fbgen&v=75
   • http://glyk.ch/**********/?action=fbgen&v=75
   • http://pokeherstars.com/**********/?action=fbgen&v=75
   • http://www.microscoop.net/**********/?action=fbgen&v=75




It tries to executes the following files:

– Filename:
   • %WINDIR%\freddy75.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 Thursday, April 1, 2010
Description updated by Petre Galan on Thursday, April 1, 2010

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