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Antivirus Bypass Techniques

Antivirus Bypass Techniques

By : Nir Yehoshua, Uriel Kosayev
4.3 (23)
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Antivirus Bypass Techniques

Antivirus Bypass Techniques

4.3 (23)
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)
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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

Antivirus bypass using obfuscation

Obfuscation is a simple technique of changing a form of code—such as source code and byte code—to make it less readable. For example, an Android Package Kit (APK) file can easily be decompiled to make it readable to Java code.

Here is an example of a decompilation process:

Figure 5.1 – Basic decompilation process

An app developer does not want unauthorized individuals to see their code, so the developer will use an obfuscation technique to protect the code and make it unreadable.

There are several obfuscation techniques. These are the two main techniques we have used in our research:

  • Rename obfuscation
  • Control-flow obfuscation

Let's look at both of these techniques in detail.

Rename obfuscation

With this technique, obfuscation is mainly performed on the variable names within the code. This technique makes it difficult to read and understand the code, as well as to understand...

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