Name:O365 Block User Consent For Risky Apps Disabled id:12a23592-e3da-4344-8545-205d3290647c version:3 date:2024-09-30 author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic detects when the "risk-based step-up consent" security setting in Microsoft 365 is disabled. It monitors Azure Active Directory logs for the "Update authorization policy" operation, specifically changes to the "AllowUserConsentForRiskyApps" setting. This activity is significant because disabling this feature can expose the organization to OAuth phishing threats, allowing users to grant consent to malicious applications. If confirmed malicious, attackers could gain unauthorized access to user data and sensitive information, leading to data breaches and further compromise within the organization. Data_source:
how_to_implement:You must install the Splunk Microsoft Office 365 Add-on and ingest Office 365 management activity events. known_false_positives:Legitimate changes to the 'risk-based step-up consent' setting by administrators, perhaps as part of a policy update or security assessment, may trigger this alert, necessitating verification of the change's intent and authorization. References: -https://attack.mitre.org/techniques/T1562/ -https://goodworkaround.com/2020/10/19/a-look-behind-the-azure-ad-permission-classifications-preview/ -https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/configure-risk-based-step-up-consent -https://learn.microsoft.com/en-us/defender-cloud-apps/investigate-risky-oauth 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: - 'Office 365 Account Takeover' asset_type:O365 Tenant atomic_guid: confidence:50 impact:60 message:Risk-based step-up consent security setting was disabled by $user$ mitre_attack_id: - 'T1562' observable: name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' risk_score:30 required_fields: - '_time' - 'Workload' - 'Operation' - 'ModifiedProperties{}.Name' - 'ModifiedProperties{}.NewValue' - 'user' - 'user_agent' security_domain:audit
