Name:Windows WMI Impersonate Token id:cf192860-2d94-40db-9a51-c04a2e8a8f8b version:3 date:2024-09-30 author:Teoderick Contreras, Splunk status:production type:Anomaly Description:The following analytic detects potential WMI token impersonation activities in a process or command. It leverages Sysmon EventCode 10 to identify instances where `wmiprvse.exe` has a duplicate handle or full granted access in a target process. This behavior is significant as it is commonly used by malware like Qakbot for privilege escalation or defense evasion. If confirmed malicious, this activity could allow an attacker to gain elevated privileges, evade defenses, and maintain persistence within the environment. Data_source:
-Sysmon EventID 10
search:`sysmon` EventCode=10 SourceImage = "*\\wmiprvse.exe" GrantedAccess IN ("0x1478", "0x1fffff") | stats count min(_time) as firstTime max(_time) as lastTime by SourceImage TargetImage SourceProcessGUID TargetProcessGUID SourceProcessId TargetProcessId GrantedAccess CallTrace dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_wmi_impersonate_token_filter`
how_to_implement:This search requires Sysmon Logs and a Sysmon configuration, which includes EventCode 10. This search uses an input macro named `sysmon`. We strongly recommend that you specify your environment-specific configurations (index, source, sourcetype, etc.) for Windows Sysmon logs. Replace the macro definition with configurations for your Splunk environment. The search also uses a post-filter macro designed to filter out known false positives. known_false_positives:administrator may execute impersonate wmi object script for auditing. Filter is needed. References: -https://github.com/trustedsec/SysmonCommunityGuide/blob/master/chapters/process-access.md -https://www.joesandbox.com/analysis/278341/0/html drilldown_searches: name:'View the detection results for - "$dest$"' search:'%original_detection_search% | search dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") 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: - 'Qakbot' asset_type:Endpoint confidence:50 impact:50 message:wmiprvse.exe process having a duplicate or full Granted Access $GrantedAccess$ to $TargetImage$ process in $dest$ mitre_attack_id: - 'T1047' observable: name:'dest' type:'Endpoint' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'SourceImage' - 'TargetImage' - 'SourceProcessGUID' - 'TargetProcessGUID' - 'SourceProcessId' - 'TargetProcessId' - 'GrantedAccess' - 'CallTrace' - 'dest' risk_score:25 security_domain:endpoint
