Zombies and botnets: help keep your computer under your control
Online criminals can use a virus to take control of large numbers of computers at a time, and turn them into "zombies" that can work together as a powerful "botnet" to perform malicious tasks.
Botnets, which can include as many as 100,000 individual "zombie" computers, can distribute spam e-mail, spread viruses, and attack other computers and servers, and commit other kinds of crime and fraud.
Botnets are highly valued by online criminals, and have become a serious problem on the Internet. Two major viruses (netsky and bagel) were created to compete for control of a large botnet, and botnet-controlled zombie computers have even been found in places such as the United States Department of Defense. Zombies and botnets: viruses, Microsoft security at home
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