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https://github.com/splunk/security_content
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Eric
64 lines
3.7 KiB
YAML
64 lines
3.7 KiB
YAML
name: GitHub Enterprise Remove Organization
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id: 94cb89aa-aec1-4585-91b1-affcdacf357e
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version: 2
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date: '2025-05-02'
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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 a user removes an organization from GitHub Enterprise.
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The detection monitors GitHub Enterprise audit logs for organization deletion events, which could indicate unauthorized removal of critical business resources.
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For a SOC, identifying organization removals is crucial as it may signal account compromise, insider threats, or malicious attempts to disrupt business operations
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by deleting entire organizational structures. The impact could be severe, potentially resulting in loss of source code, repositories, team structures, access controls,
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and other critical organizational assets. This disruption could halt development workflows, cause data loss, and require significant effort to restore from backups
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if available. Additionally, unauthorized organization removal could be part of a larger attack campaign aimed at destroying or compromising enterprise assets.
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data_source:
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- GitHub Enterprise Audit Logs
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search: '`github_enterprise` action=business.remove_organization
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime by actor, actor_id, actor_is_bot, actor_location.country_code, business, business_id, org, org_id, user_agent, action
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| eval user=actor
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `github_enterprise_remove_organization_filter`'
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how_to_implement: 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.
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known_false_positives: unknown
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references:
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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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- 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
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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 ("$user$") starthoursago=168 | 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: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: $user$ removed an organization from GitHub Enterprise
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risk_objects:
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- field: user
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type: user
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score: 25
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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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tags:
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analytic_story:
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- GitHub Malicious Activity
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asset_type: GitHub
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mitre_attack_id:
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- T1485
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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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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/T1485/github_remove_organization/github.json
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source: http:github
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sourcetype: httpevent
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