ID | Technique | Tactic |
---|---|---|
T1562.001 | Disable or Modify Tools | Defense Evasion |
T1195 | Supply Chain Compromise | Initial Access |
Detection: GitHub Enterprise Disable Classic Branch Protection Rule
Description
The following analytic detects when classic branch protection rules are disabled in GitHub Enterprise. The detection monitors GitHub Enterprise audit logs for branch protection removal events by tracking actor details, repository information, and associated metadata. For a SOC, identifying disabled branch protection is critical as it could indicate attempts to bypass code review requirements and security controls. Branch protection rules are essential security controls that enforce code review, prevent force pushes, and maintain code quality. Disabling these protections could allow malicious actors to directly push unauthorized code changes or backdoors to protected branches. The impact of disabled branch protection includes potential code tampering, bypass of security reviews, introduction of vulnerabilities or malicious code, and compromise of software supply chain integrity. This activity could be part of a larger attack chain where an adversary first disables security controls before attempting to inject malicious code.
Search
1`github_enterprise` action=protected_branch.destroy
2| fillnull
3| stats count min(_time) as firstTime max(_time) as lastTime by actor, actor_id, actor_ip, actor_is_bot, actor_location.country_code, business, business_id, org, org_id, repo, repo_id, user_agent, action, name
4| eval user=actor
5| `security_content_ctime(firstTime)`
6| `security_content_ctime(lastTime)`
7| `github_enterprise_disable_classic_branch_protection_rule_filter`
Data Source
Name | Platform | Sourcetype | Source |
---|---|---|---|
GitHub Enterprise Audit Logs | N/A | 'httpevent' |
'http:github' |
Macros Used
Name | Value |
---|---|
github_enterprise | source=http:github sourcetype=httpevent |
github_enterprise_disable_classic_branch_protection_rule_filter | search * |
github_enterprise_disable_classic_branch_protection_rule_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
Default Configuration
This detection is configured by default in Splunk Enterprise Security to run with the following settings:
Setting | Value |
---|---|
Disabled | true |
Cron Schedule | 0 * * * * |
Earliest Time | -70m@m |
Latest Time | -10m@m |
Schedule Window | auto |
Creates Risk Event | True |
Implementation
You must ingest GitHub Enterprise logs using Audit log streaming as described in this documentation https://docs.github.com/en/enterprise-cloud@latest/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/streaming-the-audit-log-for-your-enterprise#setting-up-streaming-to-splunk using a Splunk HTTP Event Collector.
Known False Positives
unknown
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message:
$user$ disabled a classic branch protection rule in repo $repo$
Risk Object | Risk Object Type | Risk Score | Threat Objects |
---|---|---|---|
user | user | 25 | user_agent |
References
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | ✅ Passing | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | http:github |
httpevent |
Integration | ✅ Passing | Dataset | http:github |
httpevent |
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
Source: GitHub | Version: 1