yara-rule-authoring

Guide authoring YARA-X rules for malware detection with naming and string selection.

Updated Jun 9, 2026

Search Tags:#malware detection #yara #yara-x #malware analysis #rule authoring

Ready to run

npx skills add https://github.com/iiammae/opero --skill yara-rule-authoring-iiammae

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: yara-rule-authoring
Source: https://github.com/iiammae/opero/tree/main/.agents/skills/yara-rule-authoring
Command: npx skills add https://github.com/iiammae/opero --skill yara-rule-authoring-iiammae

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 guides the authoring of high-quality YARA-X detection rules, enabling the identification of malware with precision and efficiency.

Core Features & Use Cases

Rule Authoring Guide: Step-by-step instructions for creating rules, including naming conventions, string selection, and performance optimization.
Platform Support: Offers guidance for detecting malware across Windows, macOS, Linux, and mobile platforms.
Module Usage: In-depth explanation of YARA-X modules like crx for Chrome extensions and dex for Android apps.
Migrating from Legacy YARA: Guidance for converting legacy YARA rules to YARA-X.

Quick Start

Use the yara-rule-authoring skill to generate a YARA rule for detecting malware that uses the "coinhive.min.js" script, commonly used in cryptojacking attacks.

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 effective YARA-X rules for malware detection?▼

To write effective YARA-X rules for malware detection, follow structured guidelines for naming conventions, string selection, and performance optimization, ensuring your rules identify malware with precision and efficiency across targeted platforms.

What is the best way to migrate legacy YARA rules to YARA-X?▼

The best way to migrate legacy YARA rules to YARA-X involves following specific conversion guidance to update syntax and logic. This ensures your existing malware detection rules remain compatible and performant in the new YARA-X environment.

Does YARA-X support malware detection across Windows, macOS, and mobile platforms?▼

Yes, YARA-X supports malware detection across Windows, macOS, Linux, and mobile platforms, providing specialized modules like crx for Chrome extensions and dex for Android apps to enable comprehensive cross-platform analysis.

How do I optimize YARA-X rules for performance during malware analysis?▼

You can optimize YARA-X rules for performance by applying specific string selection guidelines and performance optimization techniques. This prevents slow scanning and ensures efficient malware identification across large file sets.

Do I need prior malware analysis experience to author YARA-X rules?▼

Yes, you need familiarity with malware analysis to author YARA-X rules effectively. The rule authoring process requires understanding malware behavior and string identification to create precise and actionable detection logic.

Can I use YARA-X modules to detect malware in Android apps?▼

Yes, you can use the YARA-X dex module to detect malware in Android apps. The skill provides in-depth explanations for utilizing platform-specific modules to identify malicious behavior in mobile applications.