Virus-like program that spreads automatically to other computers by sending itself out by email or by any other means. A program that propagates itself by attacking other machines and copying itself to the affected machine.
Worms have self-replicating code that travels from machine to machine by various means. A worms first objective is merely propagation. Worms can be destructive depending on what payload they have been given. Worms may replace files, but do not insert themselves into files.
Comment:
W32.Stration is a mass-mailing worm that sends itself to all the email addresses gathered from the compromised computer.
It also blocks access to several security related web sites by modifying Windows Hosts file.
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