Book Image

Learn Azure Sentinel

By : Richard Diver, Gary Bushey
Book Image

Learn Azure Sentinel

By: Richard Diver, Gary Bushey

Overview of this book

Azure Sentinel is a Security Information and Event Management (SIEM) tool developed by Microsoft to integrate cloud security and artificial intelligence (AI). Azure Sentinel not only helps clients identify security issues in their environment, but also uses automation to help resolve these issues. With this book, you’ll implement Azure Sentinel and understand how it can help find security incidents in your environment with integrated artificial intelligence, threat analysis, and built-in and community-driven logic. This book starts with an introduction to Azure Sentinel and Log Analytics. You’ll get to grips with data collection and management, before learning how to create effective Azure Sentinel queries to detect anomalous behaviors and patterns of activity. As you make progress, you’ll understand how to develop solutions that automate the responses required to handle security incidents. Finally, you’ll grasp the latest developments in security, discover techniques to enhance your cloud security architecture, and explore how you can contribute to the security community. By the end of this book, you’ll have learned how to implement Azure Sentinel to fit your needs and be able to protect your environment from cyber threats and other security issues.
Table of Contents (22 chapters)
1
Section 1: Design and Implementation
4
Section 2: Data Connectors, Management, and Queries
9
Section 3: Security Threat Hunting
14
Section 4: Integration and Automation
17
Section 5: Operational Guidance

Performing a hunt

While there are no real set rules on how to run a hunt, there are some steps that you can take to focus your work: develop a premise, determine the data, plan the hunt, execute the investigation, respond, monitor, and improve.

As shown in the following diagram, this is a never-ending process. As new logs are added or new threats are recognized, this will be done over and over again. Even something as simple as checking for a malicious IP address will most likely be done many times and, based on previous findings, can be improved upon. You can find the logs that are most likely to contain the IP address and check those first, rather than blindly searching across all logs:

Figure 10.25 – Threat-hunting life cycle

As you can see from the preceding diagram, there are various steps to performing an investigation. Each step is described in further detail next.

Develop premise

In this step, you need to determine what it is you are...