Sigma Cyber Security: Professional Cyber Security Services

Typical Sigma Cyber Security have hundreds or thousands of devices generating millions of log events each minute. It can be challenging for SOC and Threat Intel teams to separate malicious activity from the daily noise of their systems. That’s where Sigma rules come in.

Sigma is an open-source rule format for sharing detections (alerts) in a common language. Like YARA and Snort rules, Sigma allows defenders to crowdsource detection methods and create search queries that can be used across multiple SIEM platforms and repositories.

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It also frees security engineers from vendor and platform-specific detection languages and repositories, avoiding vendor lock in. Additionally, it can be used to create and share custom detectors that can be used as detections for specific use cases.

The Sigma rule format is a YAML file that has standardized sections and fields, including a title field for the rule which describes what it does in no more than 50 characters. Other important fields include a status that can be stable, testing, experimental, or unsupported, and the logsource field which specifies the source of the log event/entry for which the rule will trigger an alert.

Sigma rules can be difficult to write correctly, especially for new threat intelligence analysts. However, a number of resources have been developed to help defenders and researchers get started. The official Sigma wiki and some of the rules creation guides written by security experts are good places to start. A quick browse of SOC Prime’s Threat Bounty Program will also reveal a number of well-crafted Sigma rules that can be referenced for inspiration and learning.