Zombies
Also known as "bots" or "IRC bots," these are small executables inserted onto the computers of unsuspecting users for use in a distributed denial of service attack. A "Zombiemaster" can then use these applications to flood a particular site with packets in a distributed denial-of-service attack. When an unsuspecting user logs onto the Internet (which happens automatically on a cable-modem or DSL connection), the bots log into an IRC server to await commands from the Zombiemaster.
Additional resources
The Strange Tale of the Denial of Service Attacks Against GRC.com
Steve Gibson details his battles against a Zombiemaster.
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