The denial-of-service attacks that brought major e-commerce Web sites to their knees earlier this year were launched by malicious software hidden on hundreds of Internet-connected computers without their owners' knowledge.Ī mini-industry of organizations, professionals and volunteers has sprung up to categorize malicious software, issue warnings and market software designed to detect, locate and eradicate such programs. The Chernobyl and Melissa viruses and the program caused extensive PC damage after spreading themselves around the world through e-mail last year. The different types of malicious software work by a variety of methods, and they have different potentials for causing damage. Viruses, worms, Trojan horses, logic bombs, zombies, password grabbers - the list gets longer and longer. Few aspects of computer security have achieved the notoriety of malicious software that preys on unsuspecting computer users.
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