Name:Steal or Forge Authentication Certificates Behavior Identified id:87ac670e-bbfd-44ca-b566-44e9f835518d version:3 date:2024-09-30 author:Michael Haag, Splunk status:production type:Correlation Description:The following analytic identifies potential threats related to the theft or forgery of authentication certificates. It detects when five or more analytics from the Windows Certificate Services story trigger within a specified timeframe. This detection leverages aggregated risk scores and event counts from the Risk data model. This activity is significant as it may indicate an ongoing attack aimed at compromising authentication mechanisms. If confirmed malicious, attackers could gain unauthorized access to sensitive systems and data, potentially leading to severe security breaches. Data_source:
search:| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime sum(All_Risk.calculated_risk_score) as risk_score, count(All_Risk.calculated_risk_score) as risk_event_count, values(All_Risk.annotations.mitre_attack.mitre_tactic_id) as annotations.mitre_attack.mitre_tactic_id, dc(All_Risk.annotations.mitre_attack.mitre_tactic_id) as mitre_tactic_id_count, values(All_Risk.annotations.mitre_attack.mitre_technique_id) as annotations.mitre_attack.mitre_technique_id, dc(All_Risk.annotations.mitre_attack.mitre_technique_id) as mitre_technique_id_count, values(All_Risk.tag) as tag, values(source) as source, dc(source) as source_count from datamodel=Risk.All_Risk where All_Risk.analyticstories="Windows Certificate Services" All_Risk.risk_object_type="system" by All_Risk.risk_object All_Risk.risk_object_type All_Risk.annotations.mitre_attack.mitre_tactic | `drop_dm_object_name(All_Risk)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | where source_count >= 5 | `steal_or_forge_authentication_certificates_behavior_identified_filter`
how_to_implement:The Windows Certificate Services analytic story must have 5 or more analytics enabled. In addition, ensure data is being logged that is required. Modify the correlation as needed based on volume of noise related to the other analytics. known_false_positives:False positives may be present based on automated tooling or system administrators. Filter as needed. References: -https://research.splunk.com/stories/windows_certificate_services/ -https://attack.mitre.org/techniques/T1649/ drilldown_searches: name:'View the detection results for - "$risk_object$"' search:'%original_detection_search% | search risk_object = "$risk_object$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$risk_object$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$risk_object$") 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: - 'Windows Certificate Services' asset_type:Endpoint atomic_guid: - '290df60e-4b5d-4a5e-b0c7-dc5348ea0c86' - '78b274f8-acb0-428b-b1f7-7b0d0e73330a' - '7617f689-bbd8-44bc-adcd-6f8968897848' confidence:90 impact:80 message:Steal or Forge Authentication Certificates Behavior Identified on $risk_object$. mitre_attack_id: - 'T1649' observable: name:'risk_object' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' risk_score:72 required_fields: - 'All_Risk.analyticstories' - 'All_Risk.risk_object_type' - 'All_Risk.risk_object' - 'All_Risk.annotations.mitre_attack.mitre_tactic' - 'source' security_domain:endpoint
