Sigma rules are textual signatures written in YAML that make it possible to detect anomalies in your environment by monitoring log events that can be signs of suspicious activity and cyber threats.
Sigma is an open standard for signature rule format that allows you to describe searches on log data in generic YAML form. The rule format is easy to write and applicable to any type of log data.
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Explanation:
Sigma rules are textual signatures written in YAML that make it possible to detect anomalies in your environment by monitoring log events that can be signs of suspicious activity and cyber threats.
Answer:
Sigma is an open standard for signature rule format that allows you to describe searches on log data in generic YAML form. The rule format is easy to write and applicable to any type of log data.