new detections

detections/cloud/github_enterprise_remove_organization.yml

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+name: GitHub Enterprise Remove Organization
+id: 94cb89aa-aec1-4585-91b1-affcdacf357e
+version: 1
+date: '2025-01-16'
+author: Patrick Bareiss, Splunk
+status: production
+type: Anomaly
+description: The following analytic detects when a user removes an organization from GitHub Enterprise. 
+  The detection monitors GitHub Enterprise audit logs for organization deletion events, which could indicate unauthorized removal of critical business resources. 
+  For a SOC, identifying organization removals is crucial as it may signal account compromise, insider threats, or malicious attempts to disrupt business operations 
+  by deleting entire organizational structures. The impact could be severe, potentially resulting in loss of source code, repositories, team structures, access controls, 
+  and other critical organizational assets. This disruption could halt development workflows, cause data loss, and require significant effort to restore from backups 
+  if available. Additionally, unauthorized organization removal could be part of a larger attack campaign aimed at destroying or compromising enterprise assets.
+data_source:
+- GitHub Enterprise Audit Logs
+search: '`github_enterprise` action=business.remove_organization
+  | fillnull
+  | 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, user_agent, action
+  | eval user=actor
+  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` 
+  | `github_enterprise_remove_organization_filter`'
+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.
+known_false_positives: unknown
+references:
+- https://www.googlecloudcommunity.com/gc/Community-Blog/Monitoring-for-Suspicious-GitHub-Activity-with-Google-Security/ba-p/763610
+- 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
+drilldown_searches:
+- name: View the detection results for - "$user$"
+  search: '%original_detection_search% | search  user = "$user$"'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: View risk events for the last 7 days for - "$user$"
+  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)`'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+tags:
+  analytic_story:
+  - GitHub Malicious Activity
+  asset_type: GitHub
+  confidence: 90
+  impact: 30
+  message: $user$ removed an organization from GitHub Enterprise
+  mitre_attack_id:
+  - T1485
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - actor
+  - actor_id
+  - actor_ip
+  - actor_is_bot
+  - actor_location.country_code
+  - business
+  - business_id
+  - org
+  - org_id
+  - user_agent
+  risk_score: 27
+  security_domain: network
+tests:
+- name: True Positive Test
+  attack_data:
+  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/github_remove_organization/github.json
+    source: http:github
+    sourcetype: httpevent
+

detections/cloud/github_enterprise_repository_deleted.yml

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+name: GitHub Enterprise Repository Deleted
+id: f709e736-3e6c-492f-b865-bc7696cc24a7
+version: 1
+date: '2025-01-16'
+author: Patrick Bareiss, Splunk
+status: production
+type: Anomaly
+description: The following analytic detects when a user deletes a repository in GitHub Enterprise. 
+  The detection monitors GitHub Enterprise audit logs for repository deletion events, which could indicate unauthorized removal of critical source code and project resources. 
+  For a SOC, identifying repository deletions is crucial as it may signal account compromise, insider threats, or malicious attempts to destroy intellectual property and 
+  disrupt development operations. The impact could be severe, potentially resulting in permanent loss of source code, documentation, project history, and other critical assets 
+  if proper backups are not maintained. Repository deletion could halt development workflows, cause significant business disruption, and require substantial effort to restore 
+  from backups if available. Additionally, unauthorized repository removal could be part of a larger attack campaign aimed at destroying or compromising enterprise assets.
+data_source:
+- GitHub Enterprise Audit Logs
+search: '`github_enterprise` action=repo.destroy
+  | fillnull
+  | 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, visibility, action
+  | eval user=actor
+  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` 
+  | `github_enterprise_repository_deleted_filter`'
+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.
+known_false_positives: unknown
+references:
+- https://www.googlecloudcommunity.com/gc/Community-Blog/Monitoring-for-Suspicious-GitHub-Activity-with-Google-Security/ba-p/763610
+- 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
+drilldown_searches:
+- name: View the detection results for - "$user$"
+  search: '%original_detection_search% | search  user = "$user$"'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: View risk events for the last 7 days for - "$user$"
+  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)`'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+tags:
+  analytic_story:
+  - GitHub Malicious Activity
+  asset_type: GitHub
+  confidence: 90
+  impact: 30
+  message: $user$ deleted a repository in GitHub Enterprise
+  mitre_attack_id:
+  - T1485
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - actor
+  - actor_id
+  - actor_ip
+  - actor_is_bot
+  - actor_location.country_code
+  - business
+  - business_id
+  - org
+  - org_id
+  - repo
+  - repo_id
+  - user_agent
+  risk_score: 27
+  security_domain: network
+tests:
+- name: True Positive Test
+  attack_data:
+  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/github_delete_repository/github.json
+    source: http:github
+    sourcetype: httpevent
+
+