The Early Bird Gets the Botnet: A Markov Chain Based Early Warning System for Botnet Attacks

摘要

Botnet threats include a plethora of possible attacks ranging from distributed denial of service (DDoS), to drive-by-download malware distribution and spam. While for over two decades, techniques have been proposed for either improving accuracy or speeding up the detection of attacks, much of the damage is done by the time attacks are contained. In this work we take a new direction which aims to predict forthcoming attacks (i.e. before they occur), providing early warnings to network administrators who can then prepare to contain them as soon as they manifest or simply quarantine hosts. Our approach is based on modelling the Botnet infection sequence as a Markov chain with the objective of identifying behaviour that is likely to lead to attacks. We present the results of applying a Markov model to real world Botnets' data, and show that with this approach we are successfully able to predict more than 98% of attacks from a variety of Botnet families with a very low false alarm rate.