Name:Azure AD Successful Authentication From Different Ips id:be6d868d-33b6-4aaa-912e-724fb555b11a version:6 date:2024-09-30 author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic detects an Azure AD account successfully authenticating from multiple unique IP addresses within a 30-minute window. It leverages Azure AD SignInLogs to identify instances where the same user logs in from different IPs in a short time frame. This behavior is significant as it may indicate compromised credentials being used by an adversary, potentially following a phishing attack. If confirmed malicious, this activity could allow unauthorized access to corporate resources, leading to data breaches or further exploitation within the network. Data_source:
-Azure Active Directory
search:`azure_monitor_aad` properties.authenticationDetails{}.succeeded=true category=SignInLogs | rename properties.* as * | bucket span=30m _time | stats count min(_time) as firstTime max(_time) as lastTime dc(src_ip) AS unique_ips values(src_ip) as src_ip values(appDisplayName) as appDisplayName by user | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | where unique_ips > 1 | `azure_ad_successful_authentication_from_different_ips_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 through an EventHub. This analytic was written to be used with the azure:monitor:aad sourcetype leveraging the Signin log category. known_false_positives:A user with successful authentication events from different Ips may also represent the legitimate use of more than one device. Filter as needed and/or customize the threshold to fit your environment. References: -https://attack.mitre.org/techniques/T1110 -https://attack.mitre.org/techniques/T1110.001 -https://attack.mitre.org/techniques/T1110.003 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: - 'Compromised User Account' - 'Azure Active Directory Account Takeover' asset_type:Azure Tenant confidence:80 impact:70 message:User $user$ has had successful authentication events from more than one unique IP address in the span of 30 minutes. mitre_attack_id: - 'T1110' - 'T1110.001' - 'T1110.003' observable: name:'user' type:'User' - role: - 'Victim' name:'src_ip' type:'IP Address' - role: - 'Attacker' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'properties.status.errorCode' - 'category' - 'properties.authenticationDetails' - 'user' - 'src_ip' - 'properties.appDisplayName' risk_score:56 security_domain:identity
