Sobig is a mass-mailing worm incorporating its own SMTP engine, according to antivirus companies. It arrives from the e-mail address "firstname.lastname@example.org" and bears a subject line such as "Re: here is that sample", "Re: Movies", "Re: Document" or "Re: Sample". The e-mail contains an attachment called "Document003.pif", "Sample.pif", "Untitled1.pif" or "Movie_0074.pif".
It affects the Windows 95, 98, Me, NT, 2000 and XP platforms. The worm was originally not considered a serious threat, but has been upgraded due to its rapid spread."
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