Virus:Worm/Koobface.cju
Date discovered:10/11/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:40.960 Bytes
MD5 checksum:35db3190c235dcbfc5e235e632599f48
IVDF version:7.01.06.216 - Tuesday, November 10, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.s
   •  Panda: W32/Koobface.HC.worm
   •  Eset: Win32/Koobface.NCK
   •  Bitdefender: Worm.Generic.98708


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%\ld15.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • C:\vx\sd.dat
   • %WINDIR%\dxxdv34567.bat



The following file is created:

– %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://ita-eg.com/**********/?action=ldgen&v=15
   • http://cleopatra.com.cy/**********/?action=ldgen&v=15
   • http://www.preferredflood.com/**********/?action=ldgen&v=15
   • http://videoleverage.com/**********/?action=ldgen&v=15
   • http://www.electronicstoday.org/**********/?action=ldgen&v=15
   • http://daveshieldsmedia.com/**********/?action=ldgen&v=15
   • http://www.redcode.rs/**********/?action=ldgen&v=15
   • http://abbottpainting.com/**********/?action=ldgen&v=15
   • http://nippontrading.se/**********/?action=ldgen&v=15
   • http://www.thedeathsquadmovement.com/**********/?action=ldgen&v=15
   • http://sigmai.co.il/**********/?action=ldgen&v=15
   • http://rowanhenderson.com/**********/?action=ldgen&v=15
   • http://www.electronicstoday.org/**********/?action=ldgen&a=544453496&v=15&l=1000&c_fb=0&c_ms=0&c_hi=0&c_tw=0&c_be=0&c_tg=0&c_nl=0
   • http://mm2dc.com/**********/?action=ldgen&v=15
   • http://stopreporter.com/**********/?action=ldgen&v=15
   • http://www.alkhoei.org/**********/?action=ldgen&v=15
   • http://www.ceutelcottage.nl/**********/?action=ldgen&v=15
   • http://veggiemama.com.hk/**********/?action=ldgen&v=15
   • http://www.folcon-mex.com/**********/?action=ldgen&v=15
   • http://lagrucostruzioni.it/**********/?action=ldgen&v=15
   • http://davedolbin.com/**********/?action=ldgen&v=15
   • http://liezerserv.com/**********/?action=ldgen&v=15
   • http://rjupnahaed.kopavogur.is/**********/?action=ldgen&v=15
   • http://exceleronmedical.com/**********/?action=ldgen&v=15
   • http://static.e-lady.pl/**********/?action=ldgen&v=15
   • http://delawyers.com/**********/?action=ldgen&v=15
Further investigation pointed out that this file is malware, too.

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

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "sysldtray"="%WINDIR%\ld15.exe"



The following registry key is changed:

– [HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\0001\Software\
   Microsoft\windows\CurrentVersion\Internet Settings]
   New value:
   • "ProxyEnable"=dword:0x00000000

 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, March 12, 2010
Description updated by Petre Galan on Friday, March 12, 2010

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