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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 junk code

Antivirus engines sometimes search within the logic of the code to perform detection on it in order to later classify it as a particular type of malware.

To make it difficult for antivirus software to search through the logic of the code, we can use junk code, which helps us make the logic of the code more complicated.

There are many ways to use this technique, but the most common methods involve using conditional jumps, irrelevant variable names, and empty functions.

For example, instead of writing malware that contains a single basic function with two ordinary variables (for instance, an IP address and a port number) with generic variable names and no conditions, it would be preferable, if we wished to complicate the code, to create three functions, of which two are empty (unused) functions. Within the malicious function, we can also add a certain number of conditions that will never occur and add some meaningless variable names.

The...

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