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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
Concepts
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Authors (2):
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Alexey Kleymenov Alexey Kleymenov
Author Profile Icon Alexey Kleymenov
Alexey Kleymenov
Alexey Kleymenov started working in the information security industry in his second year at university and now has more than 14 years of practical experience at several international cybersecurity companies. He is a malware analyst and software developer who is passionate about reverse engineering, automation, and research. Alexey has taken part in numerous investigations analyzing all types of malicious samples, has developed various systems to perform threat intelligence activities in the IT, OT, and IoT sectors, and has authored several patents. Alexey is a member of the (ISC)² organization and holds the CISSP certification. Finally, he is a founder of the RE and More project, teaching people all over the world how to perform malware analysis in the most efficient way.
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See other products by Alexey Kleymenov
Amr Thabet Amr Thabet
Author Profile Icon Amr Thabet
Amr Thabet
LinkedIn
Amr Thabet is a malware researcher and an incident handler with over 10 years of experience. He has worked in several Fortune 500 companies, including Symantec and Tenable. Currently, he is the founder of MalTrak, providing real-world in-depth training in malware analysis, incident response, threat hunting, and red teaming to help the next generation of cybersecurity enthusiasts to build their careers in cybersecurity. nAmr is also a speaker and trainer at some of the top security conferences all around the world, including Blackhat, DEFCON, Hack In Paris, and VB Conference. He was also featured in Christian Science Monitor for his work on Stuxnet.
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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

Detecting a debugger through an environment change

NtGlobalFlag is a flag at offset 0x68 of the PEB in 32-bit systems and 0xBC in 64-bit systems. During normal execution, this flag is set to zero when the process is running without the presence of a debugger, but when a debugger is attached to the process, this flag is set with the following three values:

  • FLG_HEAP_ENABLE_TAIL_CHECK (0x10)
  • FLG_HEAP_ENABLE_FREE_CHECK (0x20)
  • FLG_HEAP_VALIDATE_PARAMETERS (0x40)

The initial value of NtGlobalFlag can be changed from the registry. However, in the default situation, malware can check for the presence of a debugger using these flags by executing the following instructions:

mov eax, fs:[30h] ;Process Environment Block
mov al, [eax+68h] ;NtGlobalFlag
and al, 70h       ;Other flags can also be checked this way
cmp al, 70h       ;0x10 | 0x20 | 0x40
je <debugger_detected>

The following flags can be used in the x64 environment:

push 60h
pop rsi
gs:lodsq ;Process Environment Block
mov al, [rsi*2+rax...
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Authors (2)

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Profile icon Alexey Kleymenov
Alexey Kleymenov
Alexey Kleymenov started working in the information security industry in his second year at university and now has more than 14 years of practical experience at several international cybersecurity companies. He is a malware analyst and software developer who is passionate about reverse engineering, automation, and research. Alexey has taken part in numerous investigations analyzing all types of malicious samples, has developed various systems to perform threat intelligence activities in the IT, OT, and IoT sectors, and has authored several patents. Alexey is a member of the (ISC)² organization and holds the CISSP certification. Finally, he is a founder of the RE and More project, teaching people all over the world how to perform malware analysis in the most efficient way.
Read more
See other products by Alexey Kleymenov
Profile icon Amr Thabet
Amr Thabet
LinkedIn icon Github icon
Amr Thabet is a malware researcher and an incident handler with over 10 years of experience. He has worked in several Fortune 500 companies, including Symantec and Tenable. Currently, he is the founder of MalTrak, providing real-world in-depth training in malware analysis, incident response, threat hunting, and red teaming to help the next generation of cybersecurity enthusiasts to build their careers in cybersecurity. Amr is also a speaker and trainer at some of the top security conferences all around the world, including Blackhat, DEFCON, Hack In Paris, and VB Conference. He was also featured in Christian Science Monitor for his work on Stuxnet.
Read more
See other products by Amr Thabet
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