RSigma, an open-source Rust toolkit for the Sigma detection standard, is walked through a complete detection engineering lifecycle using a real-world identity attack scenario (MFA reset followed by suspicious login). The post traces one detection from threat advisory through rule drafting (rsigma rule draft), testing (backtest, explain, pipeline diff), CI/CD gating (GitHub Actions), real-time streaming detection with temporal correlation, risk-based alerting with enrichment and deduplication, scorecard-based rule measurement using analyst dispositions, and historical hunting via backend conversion to PostgreSQL/pySigma targets. Key capabilities highlighted include an LSP server, ADS documentation scaffolding, ATT&CK coverage mapping with DeTT&CT integration, and a dispositions API for analyst verdict ingestion. The post explicitly scopes what RSigma does not own: threat intel, adversary simulation, log storage, case management, and response.
