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Detection Engineering · SOC Analyst What's a Sigma rule and why is it useful for SOC?
Sigma rule (Florian Roth, 2017) — vendor-neutral YAML format for security detection logic. Structure: title, detection logic, log source, level. Example: detect PowerShell EncodedCommand → write once in Sigma → convert to Splunk SPL via sigmac → also convert to Elastic Lucene, QRadar AQL, Sentinel KQL. Why useful: (1) Portable across SIEMs; (2) Community-shared (SigmaHQ GitHub has 3,000+ rules); (3) Standard format for detection-as-code. SOC L2/L3 analysts must be Sigma-fluent. Modern Bangalore SOCs increasingly require detection-as-code skills with Git workflows.
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