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Mastering Malware Analysis

You're reading from   Mastering Malware Analysis The complete malware analyst's guide to combating malicious software, APT, cybercrime, and IoT attacks

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Product type Paperback
Published in Jun 2019
Publisher Packt
ISBN-13 9781789610789
Length 562 pages
Edition 1st Edition
Languages
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Authors (2):
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Alexey Kleymenov Alexey Kleymenov
Author Profile Icon Alexey Kleymenov
Alexey Kleymenov
Amr Thabet Amr Thabet
Author Profile Icon Amr Thabet
Amr Thabet
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Toc

Table of Contents (18) Chapters Close

Preface 1. Section 1: Fundamental Theory FREE CHAPTER
2. A Crash Course in CISC/RISC and Programming Basics 3. Section 2: Diving Deep into Windows Malware
4. Basic Static and Dynamic Analysis for x86/x64 5. Unpacking, Decryption, and Deobfuscation 6. Inspecting Process Injection and API Hooking 7. Bypassing Anti-Reverse Engineering Techniques 8. Understanding Kernel-Mode Rootkits 9. Section 3: Examining Cross-Platform Malware
10. Handling Exploits and Shellcode 11. Reversing Bytecode Languages: .NET, Java, and More 12. Scripts and Macros: Reversing, Deobfuscation, and Debugging 13. Section 4: Looking into IoT and Other Platforms
14. Dissecting Linux and IoT Malware 15. Introduction to macOS and iOS Threats 16. Analyzing Android Malware Samples 17. Other Books You May Enjoy

Step 3 – preventing any further attempts to change memory permissions

Unfortunately, this is not enough. The unpacking stub can easily bypass this breakpoint by changing the permission of this section to full access again by using the VirtualProtect API.

This API gives the program the ability to change the memory permissions of any memory chunk to any other permissions. You need to set a breakpoint on this API by going to CPU View and right-clicking on the disassemble area, then select C | Go To | Expression (or Ctrl + G), type in the name of the API (in our case, this is VirtualProtect) and set a breakpoint on the address it takes you to.

If the stub tries to call VirtualProtect to change the memory permissions, the debugged process will break and you can change the permission it tries to set on the first section. You can change the NewProtect value to READONLY or READWRITE and remove the EXECUTE bit from it:

Figure 8: Finding an address that VirtualProtect API changes permissions...
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