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Course Instructor: Ashish Revar

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Reversing Malicious Code
LearnREMAUnit 33

Topic 3.3 of Reversing Malicious Code

Windows API Patterns in Malware

The four core Windows API sequences — registry persistence, hook and poll keylogging, HTTP C2 communication, and dropper/downloader behaviour — with assembly examples and MITRE ATT&CK mappings.

~30 min total·4 quadrants of structured content

By the end of this topic, you will

  • Identify the registry persistence API sequence and extract path, value name, and payload path as IOCs
  • Distinguish hook-based keylogging (SetWindowsHookEx) from polling-based (GetAsyncKeyState)
  • Trace the five-call WinINet HTTP C2 sequence and extract user-agent, C2 address, and URI as IOCs
  • Distinguish a dropper from a downloader based on their API sequences
  • Map all four behaviour patterns to their MITRE ATT&CK technique IDs
Q1 · E-TUTORIAL (3)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

Windows API Patterns in Malware

The four core Windows API call sequences every analyst must recognise — registry persistence, keylogging, HTTP C2 communication, and dropper/downloader behaviour — with assembly-level examples.

18 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 — Windows API Technique Coverage

Browse all ATT&CK techniques by tactic. Each entry lists the Windows APIs used to implement it with real-world procedure examples.

EpochZero Article — njRAT Static Analysis Walkthrough

Walkthrough showing these exact API patterns in a real RAT sample including keylogging and C2 communication code.

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%