new detection

Author: Patrick Bareiss

detections/cloud/github_enterprise_disable_2FA_requirement.yml

@@ -0,0 +1,73 @@
+name: GitHub Enterprise Disable 2FA Requirement
+id: 5a773226-ebd7-480c-a819-fccacfeddcd9
+version: 1
+date: '2025-01-17'
+author: Patrick Bareiss, Splunk
+status: production
+type: Anomaly
+description: The following analytic detects when two-factor authentication (2FA) requirements are disabled in GitHub Enterprise. 
+  The detection monitors GitHub Enterprise audit logs for 2FA requirement changes by tracking actor details, organization information, 
+  and associated metadata. For a SOC, identifying disabled 2FA requirements is critical as it could indicate attempts to weaken 
+  account security controls. Two-factor authentication is a fundamental security control that helps prevent unauthorized access even if 
+  passwords are compromised. Disabling 2FA requirements could allow attackers to more easily compromise accounts through password-based attacks. 
+  The impact of disabled 2FA includes increased risk of account takeover, potential access to sensitive code and intellectual property, and 
+  compromise of the software supply chain. This activity could be part of a larger attack chain where an adversary first disables 
+  security controls before attempting broader account compromises.
+data_source:
+- GitHub Enterprise Audit Logs
+search: '`github_enterprise` action=org.disable_two_factor_requirement OR action=business.disable_two_factor_requirement
+  | fillnull
+  | stats count min(_time) as firstTime max(_time) as lastTime by actor, actor_id, actor_is_bot, actor_location.country_code, business, business_id, user_agent, action
+  | eval user=actor
+  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` 
+  | `github_enterprise_disable_2FA_requirement_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: $user$ disabled 2FA requirement 
+  mitre_attack_id:
+  - T1562.001
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - actor
+  - actor_id
+  - actor_is_bot
+  - actor_location.country_code
+  - business
+  - business_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/T1562.001/github_disable_two_factor_requirement/github.json
+    source: http:github
+    sourcetype: httpevent
+
+