Virus:Worm/Koobface.UK
Date discovered:23/06/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:32.256 Bytes
MD5 checksum:07f715ff1894def468e59113ffccff88
IVDF version:7.01.04.127 - Tuesday, June 23, 2009

 General Aliases:
   •  Mcafee: W32/Koobface.worm.gen.e
   •  Sophos: W32/Koobfa-Gen
   •  Panda: W32/Koobface.C.worm
   •  Eset: Win32/Koobface.NCK
   •  Bitdefender: Win32.Worm.Koobface.UL


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%\mstre19.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • c:\2.reg
   • %WINDIR%\22678h32.bat
   • C:\vx\x2.dat



The following files are created:

– %WINDIR%\jmmark2.dat
– %WINDIR%\22678h32.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://er20090515.com/**********
   • http://upr15may.com/**********
   • http://upr0306.com/**********
   • http://lastshanse26032009.com/**********
   • http://uprtrishest.com/**********
At the time of writing this file was not online for further investigation.

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Classes\Mime\Database\Content Type\
   application/xhtml+xml]
   • "CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
   • "Encoding"=hex:08,00,00,00
   • "Extension"=".xml"



The following registry keys are changed:

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "MigrateProxy"=dword:0x00000001
   • "ProxyEnable"=dword:0x00000000

 Miscellaneous String:
Furthermore it contains the following strings:
   • http://messaging.myspace.com/index.cfm?fuseaction=mail.sentbox
   • http://profileedit.myspace.com/index.cfm?fuseaction=accountSettings.contactInfo
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.companies
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.schools
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.lifestyle
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.basic
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.interests
   • http://profileedit.myspace.com/index.cfm?fuseaction=profile.blurbs

 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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