sigma-test

sigma-test

sigma-test is a test case runner for Sigma rules. It lets you specify example events alongside your detection rules and assert that your rule matches what you expect.

Install:

• via Homebrew: brew install bradleyjkemp/formulae/sigma-test
• via GitHub releases: download the latest binary here.
• From source: go get github.com/bradleyjkemp/sigma-test

⚠️ sigma-test evaluates rules using sigma-go which is still under development. Some syntax may not be supported yet.

Usage

Given a rule file rules/example.yml:

title: Example of using sigma-test
description: Demos a passing sigma-test rule

detection:
  ssh:
    dst_port: 22
  permitted_user:
    user:
      - alice
      - bob
  condition: ssh and not permitted_user

Test cases are stored in rules/example_test.yml, one test case per YAML document:

---
match: true
event:
  dst_port: 22
  user: charlie
---
# Shouldn't match non ssh traffic
match: false
event:
  dst_port: 443
  user: charlie
---
# Shouldn't match authorized users
match: false
event:
  dst_port: 22
  user: alice

Running sigma-test outputs that, as expected, the tests passed:

> sigma-test ./rules

rules/example.yaml          PASS

If a test fails, sigma-test tells you why:

> sigma-test ./rules/broken.yaml

rule/broken.yaml     FAIL    
                     map[dst_port:22] should have matched

exit status 1