Virus:Worm/Koobface.exa
Date discovered:08/02/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:59.392 Bytes
MD5 checksum:339e910b5aec569e30a73362fa4a851b
IVDF version:7.10.03.235 - Monday, February 8, 2010

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.e
   •  Panda: W32/Koobface.JT.worm
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Worm.Generic.225291


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%\freddy84.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %malware execution directory%\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://mm2dc.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://welovetweet.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://dentistschoice-fl.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://optimumorg.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://optimumorg.com/**********/?action=%character string%&mode=%character string%&age=%number%&a=%number%&v=%number%&crc=%number%&ie=%character string%
   • http://beautiteen.hostmaniacs.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://whoffmanchiro.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://pactivefranchises.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://mag5.kiev.ua/**********/?action=%character string%&v=%number%&crc=%number%
   • http://cia.gg/**********/?action=%character string%&v=%number%&crc=%number%
   • http://greystoneofellijay.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://ilivemusic.co.il/**********/?action=%character string%&v=%number%&crc=%number%
   • http://miltecit.co.uk/**********/?action=%character string%&v=%number%&crc=%number%




It tries to executes the following files:

– Filename:
   • %WINDIR%\freddy84.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 Wednesday, April 7, 2010
Description updated by Petre Galan on Wednesday, April 7, 2010

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