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Date discovered:09/04/2008
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:53.760 Bytes
MD5 checksum:24f590d612f3be210603dee3c298ee28
IVDF version:

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.e
   •  Sophos: Mal/Koobface-A
   •  Panda: W32/Koobface.FQ.worm
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Worm.Generic.101691

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.

It tries to download a file:

– The locations are the following:
   • http://exceleronmedical.com/**********/?action=msgen&v=24
   • http://www.electronicstoday.org/**********/?action=msgen&v=24
   • http://thyselius.tv/**********/?action=msgen&v=24
   • http://themasterengraver.com/**********/?action=msgen&v=24
   • http://asic.org.ro/**********/?action=msgen&v=24
   • http://www.smoketrend.de/**********/?action=msgen&v=24
   • http://www.folcon-mex.com/**********/?action=msgen&v=24
   • http://www.steeldog.org/**********/?action=msgen&v=24
   • http://dglbahamassc.com/**********/?action=msgen&v=24
   • http://HillCountryHeritage.com/**********/?action=msgen&v=24
   • http://prospect-m.ru/**********/?action=msgen&v=24
   • http://lineaidea.it/**********/?action=msgen&v=24
   • http://www.electronicstoday.org/**********/?action=msgen&a=544453496&v=24
   • http://hillsdemocrat.com/**********/?action=msgen&v=24
   • http://kingdom-shakers.com/**********/?action=msgen&v=24

It tries to executes the following files:

– Filename:
   • %WINDIR%\mstre24.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.

Descripción insertada por Petre Galan el jueves, 1 de abril de 2010
Descripción actualizada por Petre Galan el jueves, 1 de abril de 2010

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