W32/CEP.worm

Upon execution, the worm copies itself to the following location.

• %WinDir%\msmsgs.exe

It drops the following files:

• %WinDir%\Debug\sysdeb.ini (data file)
• %UserProfile%\Local Settings\Temp\windll.exe (BackDoor-CEP trojan)
• %SystemDir%\explorer.exe  (BackDoor-CEP trojan)

The worm adds the following registry key.

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  "Windows Messenger" = %WinDir%\msmsgs.exe

The dropped BackDoor-CEP trojan adds the following registry keys:

• HKEY_CURRENT_USER\Software\Wget 
  "klg" = 01
• HKEY_LOCAL_MACHINE\SOFTWARE\Wget
  "nck" = (binary data)
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{9B71D88C-C598-4935-C5D1-43AA4DB90836}
  "stubpath" = %SystemDir%\explorer.exe s

The BackDoor-CEP trojan attempts to connect the following remote site and waits commands.

• christophe.[removed].net port:80
  

• Presence of file(s) and registry key(s) as previously mentioned.
• Unexpected network connections to the mentioned site(s).

The worm attemps to drop the following files into the removable drives:

• autorun.inf (root folder)
• Recycler\Recycler\autorun.exe (W32/CEP.worm)
• Recycler\Recycler\desktop.ini
  

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

• Insert the Windows XP CD into the CD-ROM drive and restart the computer.
• When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
• Select the Windows installation that is compromised and provide the administrator password.
• Issue 'fixmbr' command to restore the Master Boot Record
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

• Insert the Windows CD into the CD-ROM drive and restart the computer.
• Click on "Repair Your Computer".
• When the System Recovery Options dialog comes up, choose the Command Prompt.
• Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
• Follow onscreen instructions.
• Reset and remove the CD from CD-ROM drive.