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Course Instructor: Ashish Revar

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In-Depth Malware Analysis
LearnREMAUnit 58

Topic 5.8 of In-Depth Malware Analysis

Network Signatures and YARA Rules

YARA rule structure, string modifiers, condition logic, writing effective rules, testing with the yara CLI, Snort/Suricata rule structure with key options, and combining both for defence in depth.

~25 min total·4 quadrants of structured content

By the end of this topic, you will

  • Write a YARA rule with meta, hex bytes, ASCII strings, and a compound condition
  • Apply the correct string modifier for each scenario: ASCII, wide, nocase, fullword
  • Test a YARA rule against both a malicious file and clean system files
  • Write a Snort rule with flow, content, and pcre options for a C2 beacon
  • Explain what flow:established,to_server matches and why it reduces false positives
  • Describe how YARA and Snort/Suricata complement each other for defence in depth
Q1 · E-TUTORIAL (0)Q2 · E-CONTENT (1)Q3 · WEB RESOURCES (8)Q4 · SELF-ASSESSMENT (2)

Quadrant 1 · e-Tutorial

Video lectures and walkthroughs

Video content coming soon.

Quadrant 2 · e-Content

Articles and case studies

Education

Network Signatures and YARA Rules

Writing YARA rules for endpoint detection and Snort/Suricata rules for network detection — rule structure, string modifiers, condition logic, and how to test and validate both rule types against real samples.

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

YARA Documentation — Official

Official YARA documentation covering all string types, modifiers, condition operators, and modules.

Neo23x0 Signature Base — Community YARA Rules

High-quality community YARA rules by Florian Roth. Study the rule structure and condition patterns used by experienced analysts.

Suricata Rule Writing Guide

Official Suricata rule documentation covering all options, flow keywords, and content modifiers.

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%