Also known as Command and Control Servers (C&C), botnets are an interesting phenomenon that involves a group of compromised host machines that are controlled by a smaller number of command hosts, which sometimes are controlled by a "bot herder", the botnet's originator.
A recent article about detecting email spamming botnets was published by a series of Microsoft Researchers where they developed an innovative system called AutoRE. Naturally they tested the framework against MSN Hotmail, and their findings were pretty compelling.
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