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Course Instructor: Ashish Revar

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Reversing Malicious Code
LearnREMAUnit 34

Topic 3.4 of Reversing Malicious Code

DLL Analysis

How malicious DLLs differ from executables, DllMain as the attack entry point, export analysis including ordinal-only exports, rundll32 analysis workflow, and DLL side-loading detection.

~25 min total·4 quadrants of structured content

By the end of this topic, you will

  • Explain why DllMain under DLL_PROCESS_ATTACH is the primary malware entry point in a DLL
  • Identify a DLL using PE header Characteristics flags rather than file extension
  • Describe the strategy for analysing a DLL with ordinal-only exports
  • Load a DLL in x64dbg using rundll32 and set a breakpoint on DllMain
  • Explain the DLL search order and how side-loading exploits it
  • Detect DLL side-loading using a Procmon LoadImage filter
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

DLL Analysis

How malicious DLLs differ from executables, why DllMain is the primary attack vector, and how to analyse DLL exports using rundll32 — including ordinal-only exports and service-mode DLLs.

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 — DLL Side-Loading (T1574.002)

ATT&CK entry for DLL side-loading with real-world examples, detection guidance, and mitigations.

LOLBAS — rundll32 Abuse Documentation

Living Off The Land Binaries project entry for rundll32 — documents all known abuse scenarios beyond DLL execution.

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%