Name:Azure AD New Federated Domain Added id:a87cd633-076d-4ab2-9047-977751a3c1a0 version:5 date:2024-09-30 author:Mauricio Velazco, Gowthamaraj Rajendran, Splunk status:production type:TTP Description:The following analytic detects the addition of a new federated domain within an Azure Active Directory tenant. It leverages Azure AD AuditLogs to identify successful "Set domain authentication" operations. This activity is significant as it may indicate the use of the Azure AD identity federation backdoor technique, allowing an adversary to establish persistence. If confirmed malicious, the attacker could impersonate any user, bypassing password and MFA requirements, potentially leading to unauthorized access and control over the Azure AD environment. Data_source:
-Azure Active Directory Set domain authentication
search:`azure_monitor_aad` operationName="Set domain authentication" "properties.result"=success | rename properties.* as * | rename targetResources{}.displayName as domain | stats count min(_time) as firstTime max(_time) as lastTime by user, domain, result, operationName, src_ip | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `azure_ad_new_federated_domain_added_filter`
how_to_implement:You must install the latest version of Splunk Add-on for Microsoft Cloud Services from Splunkbase (https://splunkbase.splunk.com/app/3110/#/details). You must be ingesting Azure Active Directory events into your Splunk environment. This analytic was written to be used with the azure:monitor:aad sourcetype leveraging the AuditLogs log category. known_false_positives:In most organizations, domain federation settings will be updated infrequently. Filter as needed. References: -https://www.mandiant.com/resources/remediation-and-hardening-strategies-microsoft-365-defend-against-apt29-v13 -https://o365blog.com/post/federation-vulnerability/ -https://www.inversecos.com/2021/11/how-to-detect-azure-active-directory.html -https://www.mandiant.com/resources/blog/detecting-microsoft-365-azure-active-directory-backdoors -https://attack.mitre.org/techniques/T1484/002/ 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: - 'Azure Active Directory Persistence' asset_type:Azure Active Directory confidence:90 impact:90 message:A new federated domain, $domain$ , was added by $user$ mitre_attack_id: - 'T1484' - 'T1484.002' observable: name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'operationName' - 'properties.result' - 'src_ip' - 'properties.targetResources{}.displayName' - 'user' risk_score:81 security_domain:threat
