A generic and open signature format for describing log event detections, shareable across SIEM systems.
Sigma is a generic and open signature format for describing log event detections in a standardized, vendor-agnostic way. It allows security practitioners to write detection rules once and convert them to various SIEM query languages, solving the problem of fragmented, non-portable detection logic across different security tools.
Detection engineers, threat hunters, SOC analysts, and defensive security practitioners who need to create, share, and implement detection rules across multiple SIEM platforms.
Developers choose Sigma because it provides a unified, open standard for detection rules, enabling collaboration and reuse across the security community without being locked into a specific vendor's query language.
Main Sigma Rule Repository
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Rules are written in standardized YAML and can be converted to queries for SIEMs like Splunk, Elasticsearch, and QRadar, reducing vendor lock-in as highlighted in the README's integrations list.
Over 3000 peer-reviewed rules cover detection, hunting, compliance, and emerging threats, providing a rich, cost-free starting point for security teams.
YAML-based format makes rules portable and shareable across reports and communities, fostering collaboration as emphasized in the project philosophy.
Supports multiple use cases including generic detections, threat hunting, and compliance checks, allowing for diverse security operations needs.
Rules must be converted to SIEM-specific queries using tools like pySigma or CLI, which can introduce errors, require maintenance, and add deployment complexity.
Writing effective rules demands understanding the Sigma specification and log schemas, which can be challenging for those new to detection engineering, despite the provided guides.
With contributions from many users, some rules may have high false positive rates or need environment-specific adjustments, as acknowledged in the false positive reporting section.
Sigma Rules is an open-source alternative to the following products:
IBM QRadar custom rules are user-defined rules within QRadar that extend its detection capabilities for specific security scenarios.
Splunk Enterprise Security (ES) is Splunk's security information and event management (SIEM) solution for threat detection, investigation, and response.