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A botnet consists of the home and office computers infected with bot malware and controlled by a botmaster. Botnets are one of the largest problems against the Internet society since they are used to mount serious attacks such as Distributed Denial of Service (DDoS) and users' credentials stealing, and to misuse and waste network resources and recipients' invaluable time by sending spam email (e.g., about 88% to 92% of spams originate from botnets). The size of a botnet ranges from tens of hosts to more than ten thousand hosts; surprisingly, a botnet that Symatec discovered consists of about 400 thousand hosts.
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