Book Image

Antivirus Bypass Techniques

By : Nir Yehoshua, Uriel Kosayev
Book Image

Antivirus Bypass Techniques

By: Nir Yehoshua, Uriel Kosayev

Overview of this book

Antivirus software is built to detect, prevent, and remove malware from systems, but this does not guarantee the security of your antivirus solution as certain changes can trick the antivirus and pose a risk for users. This book will help you to gain a basic understanding of antivirus software and take you through a series of antivirus bypass techniques that will enable you to bypass antivirus solutions. The book starts by introducing you to the cybersecurity landscape, focusing on cyber threats, malware, and more. You will learn how to collect leads to research antivirus and explore the two common bypass approaches used by the authors. Once you’ve covered the essentials of antivirus research and bypassing, you'll get hands-on with bypassing antivirus software using obfuscation, encryption, packing, PowerShell, and more. Toward the end, the book covers security improvement recommendations, useful for both antivirus vendors as well as for developers to help strengthen the security and malware detection capabilities of antivirus software. By the end of this security book, you'll have a better understanding of antivirus software and be able to confidently bypass antivirus software.
Table of Contents (13 chapters)
1
Section 1: Know the Antivirus – the Basics Behind Your Security Solution
5
Section 2: Bypass the Antivirus – Practical Techniques to Evade Antivirus Software
9
Section 3: Using Bypass Techniques in the Real World

Improving antivirus detection

In this section, we will discuss how to strengthen the detection of antivirus software in order to make the antivirus software more reliable using the dynamic YARA concept, the detection of process injection attempts, and more.

Dynamic YARA

As mentioned in Chapter 5, Bypassing the Static Engine, YARA is an easy-to-use, straightforward, yet effective tool to hunt for malicious patterns in files. It can not only be used on files but also to hunt for malicious strings, functions, and opcodes at the memory level. The yarascan volatility plugin makes practical use of "dynamic" YARA to scan for potentially malicious strings and code at the memory level, or in practical terms, on a dumped memory snapshot.

We believe that all antivirus vendors should implement this strategy (if they have not already) as part of their detection engines.

Why this capability is helpful

The dynamic YARA strategy gives your antivirus detection engine the ability...