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Antivirus Bypass Techniques

You're reading from   Antivirus Bypass Techniques Learn practical techniques and tactics to combat, bypass, and evade antivirus software

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Product type Paperback
Published in Jul 2021
Publisher Packt
ISBN-13 9781801079747
Length 242 pages
Edition 1st Edition
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Authors (2):
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Uriel Kosayev Uriel Kosayev
Author Profile Icon Uriel Kosayev
Uriel Kosayev
Nir Yehoshua Nir Yehoshua
Author Profile Icon Nir Yehoshua
Nir Yehoshua
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Toc

Table of Contents (13) Chapters Close

Preface 1. Section 1: Know the Antivirus – the Basics Behind Your Security Solution
2. Chapter 1: Introduction to the Security Landscape FREE CHAPTER 3. Chapter 2: Before Research Begins 4. Chapter 3: Antivirus Research Approaches 5. Section 2: Bypass the Antivirus – Practical Techniques to Evade Antivirus Software
6. Chapter 4: Bypassing the Dynamic Engine 7. Chapter 5: Bypassing the Static Engine 8. Chapter 6: Other Antivirus Bypass Techniques 9. Section 3: Using Bypass Techniques in the Real World
10. Chapter 7: Antivirus Bypass Techniques in Red Team Operations 11. Chapter 8: Best Practices and Recommendations 12. Other Books You May Enjoy

Understanding protection rings

Before we explain vulnerabilities that can be exploited because of permission problems, it is important to understand the concept of protection rings in operating systems.

The term protection ring refers to a hierarchical mechanism implemented on CPUs and utilized by operating systems such as Windows to protect the system by providing fault tolerance and, of course, to better protect from malicious activity and behavior. Each ring in this mechanism has a unique role in the overall functioning of the operating system, as seen in the following illustration:

Figure 3.3 – Protection ring layers

The lower the number of the ring, the closer it is to the hardware and, therefore, the higher its privilege level. As you can see in the illustration, Ring 0 is the operating system kernel, which provides "back-to-back" access to the hardware from the higher rings and vice versa. Antivirus software tends to deploy its inspection...

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