Internet Worm

Worm (Internet worm) is a self-replicating malicious program that propagates over the network infecting the nodes it contacts on its route. Worms can spread via email, peer-to-peer software, Instant Messaging clients and other sources. Worms clog Internet channel by using additional bandwidth.Worms gained notoriety when Robert Morris at Cornell University created the one that shut down many Unix network computers in 1988. The most prolific worm instances are MyDoom and its derivatives – NetSky and Bagel.