Name:Okta Multi-Factor Authentication Disabled id:7c0348ce-bdf9-45f6-8a57-c18b5976f00a version:4 date:2024-09-30 author:Mauricio Velazco, Splunk status:production type:TTP Description:The following analytic identifies an attempt to disable multi-factor authentication (MFA) for an Okta user. It leverages OktaIM2 logs to detect when the 'user.mfa.factor.deactivate' command is executed. This activity is significant because disabling MFA can allow an adversary to maintain persistence within the environment using a compromised valid account. If confirmed malicious, this action could enable attackers to bypass additional security layers, potentially leading to unauthorized access to sensitive information and prolonged undetected presence in the network. Data_source:
-Okta
search:| tstats `security_content_summariesonly` count max(_time) as lastTime, min(_time) as firstTime from datamodel=Change where sourcetype="OktaIM2:log" All_Changes.object_category=User AND All_Changes.action=modified All_Changes.command=user.mfa.factor.deactivate by All_Changes.user All_Changes.result All_Changes.command sourcetype All_Changes.src | `drop_dm_object_name("All_Changes")` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `okta_multi_factor_authentication_disabled_filter`
how_to_implement:The analytic leverages Okta OktaIm2 logs to be ingested using the Splunk Add-on for Okta Identity Cloud (https://splunkbase.splunk.com/app/6553). known_false_positives:Legitimate use case may require for users to disable MFA. Filter lightly and monitor for any unusual activity. References: -https://attack.mitre.org/techniques/T1556/ -https://splunkbase.splunk.com/app/6553 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: - 'Okta Account Takeover' asset_type:Okta Tenant confidence:60 impact:50 message:MFA was disabled for User [$user$] initiated by [$src$]. Investigate further to determine if this was authorized. mitre_attack_id: - 'T1556' - 'T1556.006' observable: name:'user' type:'User' - role: - 'Victim' name:'src' type:'IP Address' - role: - 'Attacker' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'All_Changes.object_category' - 'All_Changes.action' - 'All_Changes.command' - 'All_Changes.user' - 'All_Changes.result' - 'All_Changes.src' - 'sourcetype' risk_score:30 security_domain:identity
