A mathematical exploitation of simulated uniform scanning botnet propagation dynamics for early stage detection and management

摘要

The contribution of this paper is two-fold. Firstly, we propose a botnet detection approach that is sufficiently timely to enable a containment of the botnet outbreak in a supervised network. Secondly, we show that mathematical models of botnet propagation dynamics are a viable means of achieving that level of defense from bot infections in a supervised network. Our approach is built on the idea of processing network traffic such as to localize a weakly connected subgraph within a graph that models network communications between hosts, and thus consider that subgraph as representative of a suspected botnet. We devise applied statistics to infer the propagation dynamics that would characterize the suspected botnet if this latter were indeed a botnet. The inferred dynamics are materialized into a model graph. A subgraph isomorphism search determines whether or not there is an approximate match between the model graph and any subgraph of the weakly connected subgraph. An approximate match between the two leads to a timely identification of infected hosts. We have implemented this research in the Matlab and Perl programming languages, and have validated it in practice in the Emulab network testbed. In the paper, we describe our approach in detail, and discuss experiments along with experimental data that are indicative of the effectiveness of our approach.