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Virus:Worm/Koobface.EZ
Date discovered:13/03/2009
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:12.288 Bytes
MD5 checksum:ae4019b748ad7c940c5609463d7562c6
IVDF version:7.01.02.170 - Friday, March 13, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.e virus
   •  Sophos: W32/Koobfa-Gen
   •  Panda: W32/Koobface.AD.worm
   •  Eset: Win32/Koobface.NAZ
   •  Bitdefender: Worm.Generic.47753


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%\ld%number%.exe



It deletes the initially executed copy of itself.



It deletes the following file:
   • C:\353454543.bat



The following file is created:

C:\353454543.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://wnames0603.com/**********
   • http://fdns6mar09.info/**********
   • http://er06032009.biz/**********
   • http://nua06032009.biz/**********
   • http://wnames0603.com/**********
At the time of writing this file was not online for further investigation.

 Registry One of the following values is added in order to run the process after reboot:

  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "sysldtray"="%WINDIR%\ld%number%.exe"

 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 Friday, November 27, 2009
Description updated by Petre Galan on Friday, November 27, 2009

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