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Spam e-mails and Distributed Denial Of Service (DDoS) attacks have now become critical issues to the Internet. These attacks are considered to be sent from bot infected PCs. As a bot communicates with a malicious controller over an encrypted channel and updates its code frequently, it becomes difficult to detect infected Personal Computers (PCs) using pattern-based Intrusion Detection Systems (IDSs) and AntiVirus systems (AVs). As sending attack and control packets from the bot process are independent of the user operation, a behavior monitor is effective to detect an anomaly communication.
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