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Course Instructor: Ashish Revar

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In-Depth Malware Analysis
LearnREMAUnit 52

Topic 5.2 of In-Depth Malware Analysis

Unpacking with a Debugger

The OEP concept, the ESP hardware breakpoint technique step-by-step in x32dbg, alternative breakpoint strategies, Scylla IAT rebuild workflow, dump verification, and common unpacking failures with fixes.

~35 min total·4 quadrants of structured content

By the end of this topic, you will

  • Explain why PUSHAD/POPAD enables the ESP hardware breakpoint technique
  • Apply the ten-step ESP breakpoint procedure in x32dbg to reach the OEP
  • Recognise the OEP by the standard compiler prologue pattern
  • Describe three alternative breakpoint strategies when PUSHAD/POPAD is absent
  • Execute the Scylla workflow to dump memory and rebuild the IAT into an analysable PE
  • Diagnose and fix four common unpacking failures from symptoms
Q1 · E-TUTORIAL (1)Q2 · E-CONTENT (1)Q3 · WEB RESOURCES (8)Q4 · SELF-ASSESSMENT (2)

Quadrant 1 · e-Tutorial

Video lectures and walkthroughs

Quadrant 2 · e-Content

Articles and case studies

Education

Unpacking with a Debugger

The Original Entry Point concept, the ESP hardware breakpoint technique for finding it, and the Scylla workflow for dumping and rebuilding the Import Address Table into an analysable PE.

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

Spotting Forensic Gold in Malware Strings

Discover how malware analysts extract hidden intelligence from embedded strings — URLs, registry paths, API call sequences, and C2 artefacts that reveal attacker behaviour and seed your IOC list.

Listen now

External links

Scylla — IAT Reconstruction Plugin for x64dbg

Scylla is bundled with x64dbg. Access via Plugins menu. Essential for IAT reconstruction after manual unpacking.

OpenRCE — Unpacking Tutorials Archive

Classic OpenRCE article on manual unpacking methodology. Covers ESP breakpoint technique with screenshots.

REMA eBook 2026 — Chapter 5, Manual Unpacking

Full ESP breakpoint procedure and Scylla workflow in the REMA eBook Chapter 5.

Quadrant 4 · Self-Assessment

Test your knowledge — earn a certificate on first pass

In-Depth Malware Analysis

Covers packed malware, manual unpacking, obfuscated PowerShell, fileless malware, code injection, API hooking, memory forensics with Volatility, sandbox analysis, and network signatures.

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%