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Virus:Worm/Agent.49664.1
Date discovered:27/11/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:Yes
File size:49.664 Bytes
MD5 checksum:0b2654102546d76468c057155ccca13a
IVDF version:7.10.01.115 - Friday, November 27, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.r
   •  Sophos: Mal/Koobface-A
   •  Panda: Trj/Passtealer.KB
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Worm.Generic.102217


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%\mstre24.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%

%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%\mmsmark3.dat



It tries to download a file:

– The locations are the following:
   • http://collegestationbootcamp.com/**********/?action=msgen&a=544453496&v=24
   • http://thyselius.tv/**********/?action=msgen&v=24
   • http://chrissut.co.uk/**********/?action=msgen&v=24
   • http://collegestationbootcamp.com/**********/?action=msgen&v=24
   • http://lagrucostruzioni.it/**********/?action=msgen&v=24
   • http://www.ceutelcottage.nl/**********/?action=msgen&v=24
   • http://matthall.com.au/**********/?action=msgen&v=24
   • http://mm2dc.com/**********/?action=msgen&v=24
   • http://gvpschekschov.iv-edu.ru/**********/?action=msgen&v=24
   • http://kingdom-shakers.com/**********/?action=msgen&v=24
   • http://iraqilogistic.com/**********/?action=msgen&v=24

 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.

Descrizione inserita da Petre Galan su martedì 16 marzo 2010
Descrizione aggiornata da Petre Galan su mercoledì 17 marzo 2010

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