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Description

This search detects a disabled security workflow in GitHub Actions. An attacker can disable a security workflow in GitHub actions to hide malicious code in it.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2022-04-04
  • Author: Patrick Bareiss, Splunk
  • ID: 0459f1a5-c0ac-4987-82d6-65081209f854

Annotations

ATT&CK
ID Technique Tactic
T1195.002 Compromise Software Supply Chain Initial Access
T1195 Supply Chain Compromise Initial Access
Kill Chain Phase
  • Actions on Objectives
NIST
  • PR.DS
  • PR.AC
  • DE.CM
CIS20
  • CIS 13
CVE
1
2
3
4
5
6
7
`github` workflow_run.event=push OR workflow_run.event=pull_request 
| stats values(workflow_run.name) as workflow_run.name by workflow_run.head_commit.id workflow_run.event workflow_run.head_branch workflow_run.head_commit.author.email workflow_run.head_commit.author.name workflow_run.head_commit.message workflow_run.head_commit.timestamp workflow_run.head_repository.full_name workflow_run.head_repository.owner.id workflow_run.head_repository.owner.login workflow_run.head_repository.owner.type 
| rename workflow_run.head_commit.author.name as user, workflow_run.head_commit.author.email as user_email, workflow_run.head_repository.full_name as repository, workflow_run.head_branch as branch 
| search NOT workflow_run.name=*security-testing* 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `github_actions_disable_security_workflow_filter`

Macros

The SPL above uses the following Macros:

Note that github_actions_disable_security_workflow_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • workflow_run.event
  • workflow_run.name
  • workflow_run.head_commit.id
  • workflow_run.event workflow_run.head_branch
  • workflow_run.head_commit.author.email
  • workflow_run.head_commit.author.name
  • workflow_run.head_commit.message
  • workflow_run.head_commit.timestamp
  • workflow_run.head_repository.full_name
  • workflow_run.head_repository.owner.id
  • workflow_run.head_repository.owner.login
  • workflow_run.head_repository.owner.type

How To Implement

You must index GitHub logs. You can follow the url in reference to onboard GitHub logs. Sometimes GitHub logs are truncated, make sure to disable it in props.conf. Replace security-testing with the name of your security testing workflow in GitHub Actions.

Known False Positives

unknown

Associated Analytic story

RBA

Risk Score Impact Confidence Message
27.0 30 90 Security Workflow is disabled in branch $branch$ for repository $repository$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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