Tools

Sigma Helper

Generate a starter Sigma rule from suspicious strings, IOCs, or values when you need a fast detection draft.

Tuning checklist

Review before promoting a generated Sigma rule.

Map fields

Confirm logsource product, category, field names, operators, and case behavior match the target SIEM or detection backend.

Test noise

Run the draft against benign samples, historical logs, admin activity, installers, and known business workflows before alerting broadly.

Define ownership

Name severity, alert owner, expected response, suppression rules, tuning notes, and visibility gaps before calling the rule production-ready.

Rule title Logsource product Field selector Indicators / suspicious values Severity level

Sigma output

A starter Sigma rule will appear here.

Starter Rule

Copy a safe draft shape before tuning it

Detection readiness

Sigma example

Suspicious encoded PowerShell pattern

title: Potential Encoded PowerShell Execution
id: 00000000-0000-4000-8000-000000000001
status: experimental
description: Example only. Detects common encoded PowerShell command-line patterns that require local field mapping and noise testing.
logsource:
  product: windows
  category: process_creation
detection:
  selection:
    CommandLine|contains:
      - "powershell"
      - "-enc"
  condition: selection
falsepositives:
  - Administration scripts
  - Software deployment tooling
level: medium

Example only. Map fields to your telemetry, test benign activity, and document false positives before alerting.

Promotion checklist

Before using a detection draft

Field mappingDoes the backend use the same field names and operators?

Noise testingHas the draft been checked against admin and deployment activity?

Response ownerDoes someone know what to do when it alerts?