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Malware, Viruses and Worms

Here's an interesting link that shows the evolution and timeline of worms and viruses.

Hex dump of the Blaster worm, showing a message left for Microsoft co-founder Bill Gates by the worm's programmer (Above)

worm is similar to a virus by its design, and is considered to be a sub-class of a virusWorms spread from computer to computer, but unlike a virus, it has the capability to travel without any help from a person. ... Unlike virusesTrojan horses do not replicate themselves but they can be just as destructive.

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Difference between Viruses and Malware

The World's First Cyber Crime: The Morris Worm