mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
68 lines
3.9 KiB
YAML
68 lines
3.9 KiB
YAML
name: GitHub Organizations Delete Branch Ruleset
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id: 8e454f64-4bd6-45e6-8a94-1b482593d721
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version: 10
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creation_date: '2025-01-15'
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modification_date: '2026-05-13'
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author: Patrick Bareiss, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects when branch rulesets are deleted in GitHub Organizations. The detection monitors GitHub Organizations audit logs for branch ruleset deletion events by tracking actor details, repository information, and associated metadata. For a SOC, identifying deleted branch rulesets is critical as it could indicate attempts to bypass code review requirements and security controls. Branch rulesets 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.
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data_source:
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- GitHub Organizations Audit Logs
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search: |-
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`github_organizations` vendor_action=repository_ruleset.destroy
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY actor, actor_id, actor_ip,
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actor_is_bot, actor_location.country_code, business,
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business_id, org, org_id,
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repo, repo_id, user_agent,
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vendor_action, ruleset_name
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| eval user=actor
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `github_organizations_delete_branch_ruleset_filter`
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how_to_implement: You must ingest GitHub Organizations logs using Splunk Add-on for Github using a Personal Access Token https://splunk.github.io/splunk-add-on-for-github-audit-log-monitoring/Install/ .
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known_false_positives: No false positives have been identified at this time.
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references:
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- https://splunk.github.io/splunk-add-on-for-github-audit-log-monitoring/Install/
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- https://www.googlecloudcommunity.com/gc/Community-Blog/Monitoring-for-Suspicious-GitHub-Activity-with-Google-Security/ba-p/763610
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drilldown_searches:
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- name: View the detection results for - "$user$"
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search: '%original_detection_search% | search user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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intermediate_findings:
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entities:
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- field: user
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type: user
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score: 20
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message: $user$ deleted a branch ruleset in repo $repo$
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threat_objects:
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- field: user_agent
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type: http_user_agent
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analytic_story:
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- GitHub Malicious Activity
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- NPM Supply Chain Compromise
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asset_type: GitHub
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mitre_attack_id:
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- T1685
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- T1195
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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category: cloud
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/github_delete_branch_ruleset/github.json
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source: github
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sourcetype: github:cloud:audit
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test_type: unit
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