Design and Implementation of NS Record History Database for Detecting DNS-based Botnet Communication

摘要

DNS (Domain Name System) based domain name resolution service is one of the most fundamental Internet services for the Internet users and application service providers. In normal DNS based domain name resolution, the corresponding NS records are required in prior to sending DNS query to the corresponding authoritative DNS servers. However, in recent years, DNS based botnet communication has been observed in which botnet related network traffic is transferred via DNS packets. In particular, sending DNS queries to C&C servers using IP address directly without obtaining the corresponding NS records is present in some malware. In this paper, we focus on this type of botnet communication and design a NS record history database for detecting DNS-based botnet communication. We implemented a prototype system and evaluated the feature of NS records history creation as well as the checking function. Based on the evaluation results we confirmed the proposed database worked as we designed and it is expected to detect the target botnet communication.