Question

Your detection engineering team maintains a library of community Sigma rules that they want to operationalize in Google SecOps. One Sigma rule detects suspicious use of certutil.exe to download files. Rather than blindly auto-converting the Sigma rule to YARA-L, your lead insists the team review each converted rule before deploying it to production. Which reason BEST justifies this manual review step during Sigma-to-YARA-L migration?

Accepted Answer

Sigma field names must be mapped to the correct UDM fields and enumeration values, and detection logic must be validated against your environment's actual log sources to avoid silent non-matches or false positives

Answer

YARA-L cannot express the same detection logic as Sigma, so every rule must be fundamentally redesigned from scratch

Answer

Sigma rules are encrypted by default and must be manually decrypted before they can run in Google SecOps

Answer

Google SecOps blocks all imported third-party rules until they are individually signed by a Google-issued certificate