SoBig, also known as W32.Sobig.F@mm, is a mass-mailing, network-aware worm that sends itself to all the email addresses it finds in the files that have the following extensions:
.dbx
.eml
.hlp
.htm
.html
.mht
.wab
.txt
The worm uses its own SMTP engine to propagate and attempts to create a copy of itself on accessible network shares, but fails due to bugs in the code.
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