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Also known as Bots or IRC Bots, these programs are used by hackers to deploy Distributed Denial of Service (DDoS) agents to various victim machines. For example, when an IRC Bot infected Windows PC is started, the Bot waits for the system to finish booting, and then connects to a previously designated IRC server. It then joins a secret IRC channel that is not visible to other users of the IRC server, and waits for a command from its 'owner'.

Hackers create Bot-carrying email viruses and Trojan-infected Internet downloads, and do anything they can to get their Bots into other peoples' computers. Machines that receive a Zombie will most likely also receive a complementary copy of the latest version of the incredibly invasive Sub7Server Trojan. This grants the hacker who is controlling the Zombie absolute control over the victim's machine.

A 'pulsing zombie' is one that sends its bogus messages in periodic bursts rather than continuously.