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Course Instructor: Ashish Revar

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In-Depth Malware Analysis
LearnREMAUnit 54

Topic 5.4 of In-Depth Malware Analysis

Fileless and Multi-Technology Malware

Four fileless execution techniques, WMI event subscription persistence, registry-resident payloads, multi-technology attack chain analysis, detection evidence sources, and the Astaroth case study.

~25 min total·4 quadrants of structured content

By the end of this topic, you will

  • Define fileless malware and explain why traditional file scanning cannot detect it
  • Describe the three WMI objects required for WMI event subscription persistence
  • Explain how a registry-resident payload stores and executes without a dropped file
  • Map the Astaroth attack chain to the tools required for each stage
  • Identify seven evidence sources for detecting fileless malware activity
  • Recognise five PowerShell command-line patterns indicating fileless execution
Q1 · E-TUTORIAL (4)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

Fileless and Multi-Technology Malware

How fileless malware executes entirely in memory using PowerShell download cradles, .NET reflection, WMI event subscriptions, and registry-resident payloads — with detection strategies and multi-technology attack chain analysis.

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

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

MITRE ATT&CK — Windows Management Instrumentation (T1047)

ATT&CK entry for WMI abuse including event subscription persistence with real-world examples.

Sysmon Configuration — SwiftOnSecurity

Production-ready Sysmon configuration covering WMI activity (Events 19/20/21), process creation, and network connections.

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%