SoBig.C Worm Virus Information and Removal Help

What is SoBig.C Worm and How Did I Get It?
The SoBig worm spreads through email attachments and shared network folders. It sends copies of itself via is own SMTP engine and obtains the recipient addresses from information found in files with the following extensions:
  • .wab
  • .dbx
  • .htm
  • .html
  • .eml
  • .txt

The details of the email are

Sender: bill@microsoft.com <or any of the identified recipient addresses>

The subject can be:

  • Re: Screensaver
  • Re: Movie
  • Re: Submited (004756-3463)
  • Re: 45443-343556
  • Re: Approved
  • Approved
  • Re: Your application
  • Re: Application

The message body contains: Please see the attached file.

And the attachment is one of the following

  • screensaver.scr
  • movie.pif
  • submited.pif
  • 45443.pif
  • documents.pif
  • approved.pif
  • application.pif
  • document.pif

The worm also attempts to copy itself to the following folders on all the open network shares:

  • \Windows\All Users\Start Menu\Programs\StartUp
  • Documents and Settings\All Users\Start Menu\Programs\Startup

The worm stops spreading via network shares on June 8, 2003.

How to Clean/Delete the SoBig.C Worm?

Follow these steps in removing the SoBig.C worm.

1) Terminate the running program

  • Open the Windows Task Manager by either pressing CTRL+ALT+DEL on Win9x machines or CTL+Shift+Tab and clicking on the Processes tab on WinNT/2000/XP machines.
  • Locate the following program, click on it and End Task or End Process

       System MScvb or mscvb32.exe

  • Close Task Manager

2) Remove the Registry entries

  • Click on Start, Run, Regedit
  • In the left panel go to

HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>Current Version>Run

  • In the right panel, right-click and delete the following entry

System MScvb

Repeat this procedure for the following location

HKEY_CURRENT_USER>Software>Microsoft>Windows>Current Version>Run

  • Close the Registry Editor

3) Delete the infected files

  • Click Start, point to Find or Search, and then click Files or Folders.
  • Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
  • In the "Named" or "Search for..." box, type, or copy and paste, the file names:
    msddrr.dat
    mscvb32.exe
  • Click Find Now or Search Now.
  • Delete the displayed files.

4) Reboot the computer and run a thorough virus scan using your favorite antivirus program.

For Automatic Removal of the SoBig.C worm, click on the following link

Symantec SoBig.C Automatic Removal Program

Removal of Other SoBig worm viruses

SoBig.A
SoBig.B
SoBig.C
SoBig.D
SoBig.E
SoBig.F

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