Building SIEM Detections Using Sigma Rules
Security Boulevard, Friday, July 17th, 2026
How UK SMEs can author portable log-based detections once in Sigma and deploy them across multiple SIEM backends.
Sigma rules give smaller UK organizations a structured way to write log-based security detections that port across SIEM platforms.
Sigma is described as a detection authoring layer rather than a replacement for foundational logging and telemetry work, letting teams write once and translate to backends such as Microsoft Sentinel or Splunk.
The recommended approach starts with high-value behaviors like identity abuse and PowerShell misuse, backed by disciplined testing, version control, and tuning to keep alerts actionable.
Consistent log field normalization and mapping detections to MITRE ATT&CK techniques are treated as prerequisites. Rules should be managed as code with a clear promotion and monitoring workflow.