Book Image

Industrial Cybersecurity - Second Edition

By : Pascal Ackerman
Book Image

Industrial Cybersecurity - Second Edition

By: Pascal Ackerman

Overview of this book

With Industrial Control Systems (ICS) expanding into traditional IT space and even into the cloud, the attack surface of ICS environments has increased significantly, making it crucial to recognize your ICS vulnerabilities and implement advanced techniques for monitoring and defending against rapidly evolving cyber threats to critical infrastructure. This second edition covers the updated Industrial Demilitarized Zone (IDMZ) architecture and shows you how to implement, verify, and monitor a holistic security program for your ICS environment. You'll begin by learning how to design security-oriented architecture that allows you to implement the tools, techniques, and activities covered in this book effectively and easily. You'll get to grips with the monitoring, tracking, and trending (visualizing) and procedures of ICS cybersecurity risks as well as understand the overall security program and posture/hygiene of the ICS environment. The book then introduces you to threat hunting principles, tools, and techniques to help you identify malicious activity successfully. Finally, you'll work with incident response and incident recovery tools and techniques in an ICS environment. By the end of this book, you'll have gained a solid understanding of industrial cybersecurity monitoring, assessments, incident response activities, as well as threat hunting.
Table of Contents (26 chapters)
Section 1: ICS Cybersecurity Fundamentals
Section 2:Industrial Cybersecurity – Security Monitoring
Section 3:Industrial Cybersecurity – Threat Hunting
Section 4:Industrial Cybersecurity – Security Assessments and Intel
Chapter 15: Industrial Control System Risk Assessments
Section 5:Industrial Cybersecurity – Incident Response for the ICS Environment

Detection of beaconing behavior in the ICS environment

The following activities are aimed at uncovering beaconing traffic. To support the efforts, let's first go over what malware beaconing actually entails.

Malware beaconing explained

Beaconing behavior is quite common with malware such as botnets. The bot will periodically "phone home" to its C2 or C&C server to see whether there are any updates to the botnet code or any command the bot master want the bot to perform.

From a detection perspective, beaconing attempts look like a series of connections that initiated in a steady interval, for example every 10 minutes. The following figure shows a depiction of beaconing (shorter bars) with some feedback or response activity (following longer bars):

Figure 11.1 – Typical beaconing pattern

The trick is going to be to generate a chart that makes detection of this pattern stand out among many other connections. We are going to...