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Virus Profile: W32/Checkout!91d0b88a

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Virus Profile information details
Risk Assessment: Home Low-Profiled | Corporate Low-Profiled
Date Discovered: 8/11/2007
Date Added: 8/11/2007
Origin: N/A
Length: 41,984 bytes
Type: Virus
Subtype: Internet Worm
DAT Required: 5096
Removal Instructions
   
 
 
   

Description

This detection is for a worm which is capable of spreading through MSN.

Indication of Infection

  • Presence of the files/registry keys mentioned
  • Unexpected network connection to the associated site(s).
  • MSN contacts receiving one of the messages with zip attachment.

 

Methods of Infection

This worm spreads by sending MSN Messenger contacts a message containing a malicious zip file (W32/Checkout) .
   

Virus Characteristics

 -- Update August 12, 2007 --
The risk assessment of this threat has been updated to Low-Profiled due to media attention at:
http://www.darkreading.com/document.asp?doc_id=131362

This variant of W32/Checkout may be detected as W32/Generic.Delphi.a in earlier versions of the DAT.

This worm spreads via MSN Messenger . When installed, it sends the following message(s) to contact list recipients and send a zip file named img1756.zip (~42 KB).

  • look @ my cute new puppy :-D
  • look @ this picture of me, when I was a kid
  • I just took this picture with my webcam, like it?
  • check it, i shaved my head
  • have u seen my new hair?
  • what the fuck, did you see this?
  • hey man, did you take this picture?

Upon execution, it creates a copy of itself into the Windows folder and also drop a zip file:

  • %WINDIR%\img1756.zip (W32/Checkout zipped)
  • %WINDIR%\svchost.exe (W32/Checkout)

(Where %WINDIR% is the Windows folder; e.g. C:\Windows)

It also drops a a.bat file to stop the following services. The .bat file is deleted after execution.

  • Security Center
  • winvnc4

Adds the following values to the registry:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Microsoft Genuine Logon" = "svchost.exe"

The worm connects to an IRC channel on {blocked}.basecase.info.

 

   

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

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).

1. 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.