Name:Windows Remote Management Execute Shell id:28b80028-851d-4b8d-88a5-375ba115418a version:1 date:2024-12-12 author:Teoderick Contreras, Splunk status:production type:Anomaly Description:The following analytic detects the execution of winrshost.exe initiating CMD or PowerShell processes as part of a potential payload execution. winrshost.exe is associated with Windows Remote Management (WinRM) and is typically used for remote execution. By monitoring for this behavior, the detection identifies instances where winrshost.exe is leveraged to run potentially malicious commands or payloads via CMD or PowerShell. This behavior may indicate exploitation of remote management tools for unauthorized access or lateral movement within a compromised environment, signaling a potential security incident. Data_source:
-Sysmon EventID 1
-Windows Event Log Security 4688
search:| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name="winrshost.exe" AND Processes.process_name IN ("cmd.exe","*powershell*") by Processes.parent_process_name Processes.parent_process Processes.process_name Processes.process Processes.process_guid Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_remote_management_execute_shell_filter`
how_to_implement:The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process. known_false_positives:administrator or power user can execute command shell or script remotely using WINRM. References: -https://strontic.github.io/xcyclopedia/library/winrshost.exe-6790044CEB4BA5BE6AA8161460D990FD.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: - 'Crypto Stealer' asset_type:Endpoint mitre_attack_id: - 'T1021.006' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' security_domain:endpoint
