Name:O365 Concurrent Sessions From Different Ips id:58e034de-1f87-4812-9dc3-a4f68c7db930 version:14 date:None author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic identifies user sessions in Office 365 accessed from multiple IP addresses, indicating potential adversary-in-the-middle (AiTM) phishing attacks. It detects this activity by analyzing Azure Active Directory logs for 'UserLoggedIn' operations and flags sessions with more than one associated IP address. This behavior is significant as it suggests unauthorized concurrent access, which is uncommon in normal usage. If confirmed malicious, the impact could include data theft, account takeover, and the launching of internal phishing campaigns, posing severe risks to organizational security. Data_source:
how_to_implement:You must install splunk Microsoft Office 365 add-on. This search works with o365:management:activity known_false_positives:No false positives have been identified at this time. References: -https://attack.mitre.org/techniques/T1185/ -https://breakdev.org/evilginx-2-next-generation-of-phishing-2fa-tokens/ -https://github.com/kgretzky/evilginx2 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 ("$user$") | 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:'7d' latest_offset:'0' analytic_story:['Office 365 Account Takeover', 'Scattered Lapsus$ Hunters']
