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yara-rule-authoring

Guide YARA-X rule authoring for malware detection with string selection and condition design.

Updated Aug 27, 2026
Search Tags:#security#threat hunting#malware detection#yara#yara-x#rule authoring
One-click install
npx skills add https://github.com/monmacllcapp/skill-forks --skill yara-rule-authoring-monmacllcapp
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: yara-rule-authoring
Source: https://github.com/monmacllcapp/skill-forks/tree/main/skills/security/plugins/yara-authoring/skills/yara-rule-authoring
Command: npx skills add https://github.com/monmacllcapp/skill-forks --skill yara-rule-authoring-monmacllcapp

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires yara-x, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill helps you write, review, and optimize YARA-X detection rules for malware identification, reducing false positives and improving detection performance.

Core Features & Use Cases

  • Rule Authoring Guidance: Provides principles, best practices, and decision trees for effective YARA-X rule creation.
  • Performance Optimization: Offers strategies to ensure your rules scan efficiently without slowing down systems.
  • Use Case: You've identified a new malware sample and need to write a YARA-X rule to detect it. This Skill guides you through selecting good strings, structuring conditions, and testing your rule against goodware to minimize false positives.

Quick Start

Use the yara-rule-authoring skill to help me write a YARA-X rule to detect a specific mutex pattern.

Frequently Asked Questions about yara-rule-authoring

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I write a YARA-X rule to detect malware without triggering false positives?▼

To write effective YARA-X rules for malware detection, carefully select unique strings and structure logical conditions. This Skill provides decision trees and best practices to guide string selection and test rules against goodware to minimize false positives.

What is the best way to optimize YARA-X rules for high-performance threat hunting?▼

Optimizing YARA-X rules for threat hunting requires structuring conditions to scan efficiently. This Skill offers specific performance optimization strategies to ensure your detection rules scan systems rapidly without causing processing slowdowns.

Can I migrate my existing malware detection rules from legacy YARA to YARA-X?▼

Yes, you can migrate legacy YARA rules to YARA-X. This Skill supports migration from legacy YARA and guides you through understanding YARA-X syntax and modules to ensure your malware detection rules remain effective.

Does YARA-X rule authoring support analyzing specific file formats like CRX and DEX?▼

Yes, YARA-X rule authoring supports analyzing specific file formats including Chrome extensions (CRX) and Android DEX files. This Skill provides specialized guidance for format-specific condition design and string selection.

Why do my YARA-X detection rules keep matching benign files?▼

YARA-X detection rules match benign files when string selection lacks uniqueness or conditions are too broad. This Skill helps minimize false positives by providing decision trees for effective rule creation and testing against goodware.

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