Research on Security Risk Assessment Technology of Mirai Botnet Based on Node Importance

• 1、Information Security Center, Beijing University of Posts and Telecommunications, Beijing, 100876

Abstract：The rise of the Internet of Things has brought convenience to life, and at the same time, because of the weak security measures, it has brought greater risks. Aiming at the Mirai bot virus and its variants in the Internet of Things, this paper proposes a quantitative calculation method for network security risk: monitoring each destination device according to Mirai characteristics, and introducing a security risk assessment method based on hidden Markov model, according to the observation The behavior calculates the risk value of different nodes; when calculating the network risk value, using the node relevance, the PageRank algorithm is used to obtain the node importance of each node, and the node risk value is weighted and averaged. Finally, this paper demonstrates the availability of a risk assessment model in conjunction with a real case of Mirai infection.

Keywords： Information Security Hidden Markov Model Safety Risk Assessment Node importance