Sigma Rule Creation
Create SIEM-agnostic detection rules:
- Process execution patterns
- Registry modifications
- Network connections
- Authentication events
- File operations
Required Context
- Pattern: What to detect (TTP, behavior, IOC)
- Log Source: Sysmon, Security, EDR, etc.
- Context: False positive considerations
Output
- Sigma YAML rule
- SIEM conversion commands (Splunk, Elastic, Sentinel)
Sigma Conversion
sigma convert -t splunk rule.yml
sigma convert -t elasticsearch rule.yml
sigma convert -t azure-sentinel rule.yml
Example
/sigma
Pattern: Office spawning PowerShell with encoded commands
Source: Sysmon Event 1