Publication detail

Efficient Modelling of ICS Communication For Anomaly Detection Using Probabilistic Automata

MATOUŠEK, P. HAVLENA, V. HOLÍK, L.

Original Title

Efficient Modelling of ICS Communication For Anomaly Detection Using Probabilistic Automata

Type

conference paper

Language

English

Original Abstract

Industrial Control System (ICS) communication transmits monitoring and control data between industrial processes and the control station. ICS systems cover various domains of critical infrastructure such as the power plants, water and gas distribution, or aerospace traffic control. Security of ICS systems is usually implemented on the perimeter of the network using ICS enabled firewalls or Intrusion Detection Systems (IDSs). These techniques are helpful against external attacks, however, they are not able to effectively detect internal threats originating from a compromised device with malicious software. In order to mitigate or eliminate internal threats against the ICS system, we need to monitor ICS traffic and detect suspicious data transmissions that differ from common operational communication. In our research, we obtain ICS monitoring data using standardized IPFIX flows extended with meta data extracted from ICS protocol headers. Unlike other anomaly detection approaches, we focus on modelling the semantics of ICS communication obtained from the IPFIX flows that describes typical conversational patterns. This paper presents a technique for modelling ICS conversations using frequency prefix trees and Deterministic Probabilistic Automata (DPA). As demonstrated on the attack scenarios, these models are efficient to detect common cyber attacks like the command injection, packet manipulation, network scanning, or lost connection. An important advantage of our approach is that the proposed technique can be easily integrated into common security information and event management (SIEM) systems with Netflow/IPFIX support. Our experiments are performed on IEC 60870-5-104 (aka IEC 104) control communication that is widely used for the substation control in smart grids.

Keywords

ICS, probabilistic automata, network monitoring, anomaly detection, IPFIX, IEC 104

Authors

MATOUŠEK, P.; HAVLENA, V.; HOLÍK, L.

Released

15. 1. 2021

Publisher

International Federation for Information Processing

Location

Bordeaux

ISBN

978-3-903176-32-4

Book

Proceedings of IFIP/IEEE International Symposium on Integrated Network Management

Pages from

81

Pages to

89

Pages count

9

URL

http://dl.ifip.org/db/conf/im/im2021/210993.pdf

BibTex

@inproceedings{BUT168495,
  author="Petr {Matoušek} and Vojtěch {Havlena} and Lukáš {Holík}",
  title="Efficient Modelling of ICS Communication For Anomaly Detection Using Probabilistic Automata",
  booktitle="Proceedings of IFIP/IEEE International Symposium on Integrated Network Management",
  year="2021",
  pages="81--89",
  publisher="International Federation for Information Processing",
  address="Bordeaux",
  isbn="978-3-903176-32-4",
  url="http://dl.ifip.org/db/conf/im/im2021/210993.pdf"
}