W32.Sobig.C@mm

Risk Level 2: Low

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Discovered:: May 31, 2003
Updated:: February 13, 2007 12:01:51 PM
Also Known As:: W32/Sobig.c@MM [McAfee], Win32/Sobig.C [ESET], Sobig.C [F-Secure], I-Worm.Sobig.c [KAV], WORM_SOBIG.C [Trend], Win32.Sobig.C [CA], W32/Sobig-C [Sophos]
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

NOTE: As of June 13, 2003, due to a decreased rate of submissions, Symantec Security Response has downgraded this threat from Category 3 to Category 2.

W32.Sobig.C@mm is a mass-mailing worm that sends itself to all the email addresses that it finds in the files with the following extensions:

.wab
.dbx
.htm
.html
.eml
.txt

The email falsely purports that Microsoft sent it (bill@microsoft.com).

Email Routine Details
The email message has the following characteristics:

From: bill@microsoft.com (NOTE: W32.Sobig.C@mm spoofs this field. It could be any address.)

Subject: The subject line will be one of the following:

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