Name:O365 New Federated Domain Added id:e155876a-6048-11eb-ae93-0242ac130002 version:5 date:2024-09-30 author:Rod Soto, Mauricio Velazco Splunk status:production type:TTP Description:The following analytic identifies the addition of a new federated domain in an Office 365 environment. This behavior is detected by analyzing Office 365 management activity logs, specifically filtering for Workload=Exchange and Operation="Add-FederatedDomain". The addition of a new federated domain is significant as it may indicate unauthorized changes or potential compromises. If confirmed malicious, attackers could establish a backdoor, bypass security measures, or exfiltrate data, leading to data breaches and unauthorized access to sensitive information. Immediate investigation is required to review the details of the added domain and any concurrent suspicious activities. Data_source:
-O365
search:`o365_management_activity` Operation IN ("*add*", "*new*") AND Operation="*domain*" | stats count values(ModifiedProperties{}.NewValue) as new_value by user user_agent authentication_service action Workload Operation | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `o365_new_federated_domain_added_filter`
how_to_implement:You must install splunk Microsoft Office 365 add-on. This search works with o365:management:activity. known_false_positives:The creation of a new Federated domain is not necessarily malicious, however these events need to be followed closely, as it may indicate federated credential abuse or backdoor via federated identities at a similar or different cloud provider. References: -https://www.fireeye.com/content/dam/fireeye-www/blog/pdfs/wp-m-unc2452-2021-000343-01.pdf -https://www.cisa.gov/uscert/ncas/alerts/aa21-008a -https://www.splunk.com/en_us/blog/security/a-golden-saml-journey-solarwinds-continued.html -https://blog.sygnia.co/detection-and-hunting-of-golden-saml-attack?hsLang=en -https://o365blog.com/post/aadbackdoor/ 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 Persistence Mechanisms' - 'Cloud Federated Credential Abuse' asset_type:O365 Tenant confidence:80 impact:80 message:User $user$ has added a new federated domain $new_value$ mitre_attack_id: - 'T1136.003' - 'T1136' observable: name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'Workload' - 'Operation' - 'ModifiedProperties{}.NewValue' - 'authentication_service' - 'user' - 'user_agent' - 'action' risk_score:64 security_domain:threat
