Virus:Worm/Koobface.38400D.1
Date discovered:09/02/2010
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:38.400 Bytes
MD5 checksum:879acbc3fb893a48c04165c307e43f81
IVDF version:7.10.04.02 - Tuesday, February 9, 2010

 General Aliases:
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Koobface.GI.worm
   •  Eset: Win32/Koobface.NCL
   •  Bitdefender: Trojan.Koobface.67


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %drive%\windows\pp14.exe



It overwrites a file.
– %WINDIR%\pp14.exe



It deletes the initially executed copy of itself.



It deletes the following file:
   • %WINDIR%\dxxdv34567.bat



The following files are created:

– %WINDIR%\dxxdv34567.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.
– %WINDIR%\fdgg34353edfgdfdf



It tries to download some files:

– The location is the following:
   • http://microsoft.msn.com.ero**********.info/?data=%character string%


– The location is the following:
   • http://microsoft.msn.com.eround.info/**********?456544


– The location is the following:
   • http://microsoft.msn.com.eround.info/**********?695599


– The locations are the following:
   • http://welovetweet.com/**********/?action=%character string%&v=%number%&crc=%number%
   • http://welovetweet.com/**********/?action=%character string%&a=%number%&v=%number%&pid


– The location is the following:
   • http://microsoft.msn.com.eround.info/**********?referer&screen=%character string%&url=%character string%&rand=%number%


– The location is the following:
   • http://gog**********.com/?data=%character string%




It tries to executes the following files:

– Filename:
   • cmd /c %WINDIR%\dxxdv34567.bat


– Filename:
   • "%PROGRAM FILES%\Internet Explorer\iexplore.exe" -Embedding

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "pp"="%WINDIR%\pp14.exe"



The following registry key is changed:

– [HKCU\Software\Microsoft\Internet Explorer\Toolbar]
   New value:
   • "Locked"=dword:0x00000000

 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 Monday, June 21, 2010
Description updated by Petre Galan on Monday, June 21, 2010

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