Publication details

Malicious SSL Certificate Detection: A Step Towards Advanced Persistent Threat Defence


GHAFIR Ibrahim PŘENOSIL Václav HAMMOUDEH Mohammad HAN Liangxiu UMAR Raza

Year of publication 2017
Type Article in Proceedings
Conference Proceedings of International Conference on Future Networks and Distributed Systems
MU Faculty or unit

Faculty of Informatics

Field Informatics
Keywords Cyber attacks; malware; advanced persistent threat; malicious SSL certificate; intrusion detection system.
Description Advanced Persistent Threat (APT) is one of the most serious types of cyber attacks, which is a new and more complex version of multistep attack. Within the APT life cycle, continuous communication between infected hosts and Command and Control (C&C) servers is maintained to instruct and guide the compromised machines. These communications are usually protected by Secure Sockets Layer (SSL) encryption, making it difficult to identify if the traffic directed to sites is malicious. This paper presents a Malicious SSL certificate Detection (MSSLD) module, which aims at detecting the APT C&C communications based on a blacklist of malicious SSL certificates. This blacklist consists of two forms of SSL certificates, the SHA1 fingerprints and the serial & subject, that are associated with malware and malicious activities. In this detection module, the network traffic is processed and all secure connections are filtered. The SSL certificate of each secure connection is then matched with the SSL certificate blacklist. This module was experimentally evaluated and the results show successful detection of malicious SSL certificates.

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