Sigma

Create Sigma detection rules for SIEM log-based detection

majiayu000 d14f108 2 files · 1.6 KB Updated 567 repo stars

File contents

Sigma Rule Creation

Create SIEM-agnostic detection rules:

  • Process execution patterns
  • Registry modifications
  • Network connections
  • Authentication events
  • File operations

Required Context

  1. Pattern: What to detect (TTP, behavior, IOC)
  2. Log Source: Sysmon, Security, EDR, etc.
  3. 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

majiayu000/claude-skill-registry-data/tree/main/security/sigma commit d14f108376

Frequently asked questions

npx skillmds add majiayu000/sigma