A novel method of mining network flow to detect P2P botnets

Botnets are a serious threat to cyber-security. As a consequence, botnet detection has become an important research topic in network protection and cyber-crime prevention. P2P botnets are one of the most malicious zombie networks, as their architecture imitates P2P software. Characteristics of P2P botnets include (1) the use of multiple controllers to avoid single-point failure; (2) the use of encryption to evade misuse detection technologies; and (3) the capacity to evade anomaly detection, usually by initiating numerous sessions without consuming substantial bandwidth. To overcome these difficulties, we propose a novel data mining method. First, we identify the differences between P2P botnet behavior and normal network behavior. Then, we use these differences to tune the data-mining parameters to cluster and distinguish normal Internet behavior from that lurking P2P botnets. This method can identify a P2P botnet without breaking the encryption. Furthermore, the detection system can be deployed without altering the existing network architecture, and it can detect the existence of botnets in a complex traffic mix before they attack. The experimental results reveal that the method is effective in recognizing the existence of botnets. Accordingly, the results of this study will be of value to information security academics and practitioners.