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Course Instructor: Ashish Revar

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Reversing Malicious Code
LearnREMAUnit 36

Topic 3.6 of Reversing Malicious Code

API Hooking

Inline trampoline hooking and IAT hooking — installation mechanics, trampolines, rootkit file hiding via NtQueryDirectoryFile, detection tools, and identifying hooks in x64dbg.

~25 min total·4 quadrants of structured content

By the end of this topic, you will

  • Explain how an inline trampoline hook intercepts an API call without breaking the original function
  • Describe the role of the trampoline stub in preserving original function execution
  • Explain how a rootkit uses NtQueryDirectoryFile hooks to hide files from Explorer
  • Compare inline hooking and IAT hooking on difficulty, detection, and persistence
  • Identify an inline hook in x64dbg by examining the first bytes of an API function
  • Explain why hook detection tools may flag ScyllaHide hooks during analysis
Q1 · E-TUTORIAL (1)Q2 · E-CONTENT (1)Q3 · WEB RESOURCES (7)Q4 · SELF-ASSESSMENT (2)

Quadrant 1 · e-Tutorial

Video lectures and walkthroughs

Quadrant 2 · e-Content

Articles and case studies

Education

API Hooking

How malware intercepts Windows API calls using inline trampoline hooks and IAT hooks — the mechanics of each, what trampolines are, rootkit hiding via NtQueryDirectoryFile, and detection tools.

16 min read

Quadrant 3 · Web Resources

Downloadable material and curated external links

Downloadable reference material

EBook

REMA eBook 2026

v1.0

Open resource

Cheatsheet

REMA Cheatsheet 2026

v1.0

Open resource

MCQ Bank

REMA MCQ Bank 2026

v1.0

Open resource

Question Bank

REMA Question Bank 2026

v1.0

Open resource

Featured Podcast

Podcast Episode

The Malicious Process Lifecycle: From Execution to Evasion

How malware executes, establishes persistence, injects into legitimate processes, and evades detection inside modern operating systems.

Listen now

External links

MITRE ATT&CK — Hijack Execution Flow: Import Address Table (T1574.006)

ATT&CK entry for IAT hooking with real-world examples and detection recommendations.

API Monitor — Hook-Based API Tracing Tool

Free tool that hooks hundreds of Windows APIs and logs all calls with arguments. Essential for observing hook behaviour during dynamic analysis.

Quadrant 4 · Self-Assessment

Test your knowledge — earn a certificate on first pass

Reversing Malicious Code

Covers x86 and x64 assembly analysis, control flow graphs, Windows API-level malware behaviour, DLL analysis, injection techniques, API hooking, and Living-off-the-Land attacks.

20 questions30 minPass: 60%

REMA Complete Assessment

A comprehensive 120-question assessment covering the entire Reverse Engineering and Malware Analysis curriculum: malware taxonomy and reverse engineering fundamentals, static and dynamic analysis, reversing malicious code, malicious web and document files, in-depth analysis of packed and fileless malware, and self-defending malware techniques.

120 questions90 minPass: 60%