Name:Okta Suspicious Use of a Session Cookie id:71ad47d1-d6bd-4e0a-b35c-020ad9a6959e version:4 date:2024-09-30 author:Scott Dermott, Felicity Robson, Okta, Michael Haag, Bhavin Patel, Splunk status:production type:Anomaly Description:The following analytic identifies suspicious use of a session cookie by detecting multiple client values (IP, User Agent, etc.) changing for the same Device Token associated with a specific user. It leverages policy evaluation events from successful authentication logs in Okta. This activity is significant as it may indicate an adversary attempting to reuse a stolen web session cookie, potentially bypassing authentication mechanisms. If confirmed malicious, this could allow unauthorized access to user accounts, leading to data breaches or further exploitation within the environment. Data_source:
-Okta
search:`okta` eventType IN (policy.evaluate_sign_on) outcome.result IN (ALLOW, SUCCESS) | stats earliest(_time) as _time, values(client.ipAddress) as src_ip, values(client.userAgent.rawUserAgent) as user_agent, values(client.userAgent.os) as userAgentOS_list, values(client.geographicalContext.city) as city, values(client.userAgent.browser) as userAgentBrowser_list, values(device.os_platform) as okta_device_os, dc(client.userAgent.browser) as dc_userAgentBrowser, dc(client.userAgent.os) as dc_userAgentOS, dc(client.ipAddress) as dc_src_ip, values(outcome.reason) as reason by debugContext.debugData.dtHash, user | where dc_src_ip>1 AND (dc_userAgentOS>1 OR dc_userAgentBrowser>1) | `okta_suspicious_use_of_a_session_cookie_filter`
how_to_implement:This detection utilizes logs from Okta Identity Management (IM) environments. It requires the ingestion of OktaIm2 logs through the Splunk Add-on for Okta Identity Cloud (https://splunkbase.splunk.com/app/6553). known_false_positives:False positives may occur, depending on the organization's size and the configuration of Okta. References: -https://attack.mitre.org/techniques/T1539/ 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: - 'Suspicious Okta Activity' - 'Okta Account Takeover' asset_type:Okta Tenant confidence:70 impact:80 message:A user [$user$] is attempting to use a session cookie from multiple IP addresses or devices. Investigate further to determine if this was authorized. mitre_attack_id: - 'T1539' observable: name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'client.ipAddress' - 'client.userAgent.rawUserAgent' - 'client.userAgent.os' - 'client.geographicalContext.city' - 'client.userAgent.browser' - 'device.os_platform' - 'debugContext.debugData.dtHash' - 'actor.alternateId' risk_score:56 security_domain:identity
