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Virus:Worm/Koobface.bga
Date discovered:05/08/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:Yes
File size:35.328 Bytes
MD5 checksum:a1cbceccc8693f0ceb903f15d141f8c0
IVDF version:7.01.05.77 - Wednesday, August 5, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.e
   •  Panda: W32/Koobface.EC.worm
   •  Eset: Win32/Koobface.NCF
   •  Bitdefender: Worm.Generic.79123


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


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

 Files It copies itself to the following location:
   • %WINDIR%\freddy55.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • c:\2.reg
   • C:\vx\x2.dat
   • %WINDIR%\34rdft.bat



The following files are created:

c:\2.reg This is a non malicious text file with the following content:
   • %code that runs malware%

%WINDIR%\34rdft.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
%malware execution directory%\x2.dat
%WINDIR%\th823567.dat



It tries to download some files:

The locations are the following:
   • http://uthreejuly.com/**********
   • http://u15jul.com/**********
   • http://rjulythree.com/**********
   • http://upr0306.com/**********
   • http://umidsummer.com/**********


The location is the following:
   • http://mymegadomain03072009.com/proxy/**********

 Registry The following registry key is added:

[HKLM\SOFTWARE\Classes\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.

Descrição enviada por Petre Galan em terça-feira, 16 de março de 2010
Descrição atualizada por Petre Galan em quarta-feira, 17 de março de 2010

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