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Process Name  : Mscvb32.exe

Process Path : %WINDOWS%\mscvb32.exe [ C:\Windows\mscvb32.exe]

Process type    : Internet Worm

Malware Name : W32.Sobig.C@mm

Alias             : I-Worm.Sobig.c, WORM_SOBIG.C, W32/Sobig-C, Sobig.C Worm

Threat level : Medium

Process Details

                     Mscvb32.exe is the main component dropped by Sobig.C worm. It uses e-mail addresses collected from DBX, HTML, DBX, EML, HML, TXT and WAB files to send infected messages. It is very similar to Sobig.B Worm. Sobig.C infects Windows 95, 98, ME, 2000, NT, XP systems. It also copies to shared network drives. 

                     The worm arrives with the following details. The infected e-mail attachment is chosen from the list given below


Subject is chosen from the list given below

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

The email body contains the text "Please see the attached file." and the sender field is randomly chosen by the worm.

                     When the infected attachment is executed, the worm copies itself to Windows folder as "mscvb32.exe". Sobig.C worm creates new keys in the registry Run section to load automatically. The registry modification is given below.

"System MScvb" = %Windows%\mscvb32.exe 

"System MScvb" = %Windows%\mscvb32.exe 

                     Sobig.C worm copies to the shared network drives startup folder in the remote machine. So the infected files will be executed automatically on the next startup. It copies to the following shared drives

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

How can I protect my system?

                   Solo has incorporated Mscvb32.exe in its signature file to protect users from this worm attack. Solo antivirus registered users are already protected from this worm. Make sure that you have installed registered version of Solo Antivirus to protect your system from all virus threats.

How to remove this worm?

                   Solo antivirus can detect and remove mscvb32.exe process safely. Use the following link to Download 30 day trial version of Solo antivirus to remove viruses from your computer.

                   Solo anti-virus not only scans for all viruses, it contains a unique System Integrity Checker to protect you from New Internet Worms, Backdoors and malicious VB, Java Scripts. It also effectively removes all existing Internet Worms, File viruses, malicious VB, Java scripts, Trojans, Backdoors, boot sector, partition table and macro viruses.

You can purchase Solo antivirus using the link