Full description

Virus:	Worm/Koobface.cmj
Date discovered:	23/11/2009
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	57.856 Bytes
MD5 checksum:	801c5b181c8890e8bbe2fa97f17904c2
IVDF version:	7.10.01.47 - Monday, November 23, 2009

General Aliases:
   • Mcafee: W32/Koobface.worm.gen.r
   • Sophos: Mal/Koobface-A
   • Panda: W32/Koobface.GJ.worm
   • Eset: Win32/Koobface.NCL
   • Bitdefender: Worm.Generic.101694

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://superaffiliatehookup.com/**********/?action=fbgen&v=75
   • http://thyselius.tv/**********/?action=fbgen&v=75
   • http://s247135758.onlinehome.us/**********/?action=fbgen&v=75
   • http://host-net.us/**********/?action=fbgen&v=75
   • http://aya-multimedia.co.cc/**********/?action=fbgen&v=75
   • http://www.remodelclarksville.com/**********/?action=fbgen&v=75
   • http://promini.co.il/**********/?action=fbgen&v=75
   • http://exceleronmedical.com/**********/?action=fbgen&v=75
   • http://www.docenti.dev.juga.ru/**********/?action=fbgen&v=75
   • http://iraqilogistic.com/**********/?action=fbgen&v=75
   • http://haque-law.com/**********/?action=fbgen&v=75
   • http://s266156216.onlinehome.fr/**********/?action=fbgen&v=75
   • http://matthall.com.au/**********/?action=fbgen&v=75
   • http://www.electronicstoday.org/**********/?action=fbgen&v=75
   • http://haque-law.com/**********/?action=fbgen&mode=s&age=105&a=544453496&v=75&ie=%character string%
   • http://panoramapics.com/**********/?action=fbgen&v=75
   • http://daveshieldsmedia.com/**********/?action=fbgen&v=75
   • http://www.bloomfieldlivestockmarket.com/**********/?action=fbgen&v=75
   • http://www.folcon-mex.com/**********/?action=fbgen&v=75
   • http://www.ho-fashion.com/**********/?action=fbgen&v=75
   • http://www.ecole-de-boucq.org/**********/?action=fbgen&v=75
   • http://lagrucostruzioni.it/**********/?action=fbgen&v=75
   • http://www.smoketrend.de/**********/?action=fbgen&v=75
   • http://prospect-m.ru/**********/?action=fbgen&v=75
   • http://videoleverage.com/**********/?action=fbgen&v=75
   • http://themasterengraver.com/**********/?action=fbgen&v=75
   • http://www.fototeka.rs/**********/?action=fbgen&v=75
   • http://vostravauxcleenmain.com/**********/?action=fbgen&v=75
   • http://www.steeldog.org/**********/?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 donderdag 1 april 2010
Description updated by Petre Galan on donderdag 1 april 2010

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