Remove W32.Noobert

Posted on: January 4th, 2010

Discovered: December 23, 2009
Updated: December 23, 2009 1:03:39 PM
Type: Worm
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
Recommended Action:
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Technical Details:
When the worm executes, it decrypts the host file, saves it to the following location, and executes it:

%Temp%\NOO[RANDOM CHARACTERS]

Next, it copies %System%\ctfmon.exe to the following location:

%System%\ctfmon.dll

The worm then infects all .scr and .exe files on the compromised computer.

It also randomly deletes files with the extensions, depending on how long the computer has been turned on:

  • .avi
  • .xls
  • .jpg
  • .doc

The worm modifies the following files in order to disable Windows File Protection:

  • %System%\SFC_OS.dll
  • %System%\dllcache\SFC_OS.dll

It also disables Windows File Protection by modifying the following registry entry:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\”SFCDisable” = “1″

The worm spreads through the eMule file-sharing network.

Action Steps:
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