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Sobig.C

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Sobig.C
Technical name:W32/Sobig.C
Threat level:Medium
Type:Worm
Effects:  It does not have any destructive effects. It spreads via e-mail and across networks.
Affected platforms:

Windows XP/2000/NT/ME/98/95

First detected on:June 1, 2003
Detection updated on:Oct. 25, 2007
StatisticsNo
Yes, using TruPrevent Technologies

Brief Description 

    

Sobig.C is a worm that does not have any damaging effects, which spreads via e-mail and across networks. The message carrying this worm is easy to identify, as the body of the message is always: Please see the attached file.

Once it has infected a computer, Sobig.C looks for e-mail addresses in all the files it finds on the affected computer with the following extensionsTXT, EML, HTM, HTML, DBX and WAB. It then sends a copy of itself to all these addresses.

Sobig.C can also copy itself to the Startup directories in the computers connected to the same network as the affected computer.

Visible Symptoms 

    

Sobig.C is easy to recognize when it spreads via e-mail, as the message carrying the worm always has the following characteristics:

  • Message:
    Please see the attached file.
  • Attachments: One of the following:
    SCREENSAVER.SCR
    MOVIE.PIF
    SUBMITED.PIF
    45443.PIF
    APPROVED.PIF
    APPLICATION.PIF
    DOCUMENT.PIF
    DOCUMENTS.PIF