The following analytic identifies
WmiPrvSE.exe spawning a process. This typically occurs when a process is instantiated from a local or remote process using
wmic.exe. During triage, review parallel processes for suspicious behavior or commands executed. Review the process and command-line spawning from
wmiprvse.exe. Contain and remediate the endpoint as necessary.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2020-03-16
- Author: Rico Valdez, Michael Haag, Splunk
- ID: 24869767-8579-485d-9a4f-d9ddfd8f0cac
Kill Chain Phase
- Actions on Objectives
- CIS 3
- CIS 5
1 2 3 4 5 6 | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=WmiPrvSE.exe by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `process_execution_via_wmi_filter`
The SPL above uses the following Macros:
process_execution_via_wmi_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
You must be ingesting endpoint data that tracks process activity, including parent-child relationships from your endpoints to populate the Endpoint data model in the Processes node. The command-line arguments are mapped to the "process" field in the Endpoint data model.
Known False Positives
Although unlikely, administrators may use wmi to execute commands for legitimate purposes.
Associated Analytic Story
|49.0||70||70||A remote instance execution of wmic.exe that will spawn $parent_process_name$ in host $dest$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 4