The following analytic detects the usage of the Invoke-WMIExec utility within PowerShell Script Block Logging (EventCode 4104). The utility is used for executing WMI commands on targets using NTLMv2 pass-the-hash authentication.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-03-22
- Author: Michael Haag, Splunk
- ID: 0734bd21-2769-4972-a5f1-78bb1e011224
Kill Chain Phase
- CIS 10
1 2 3 4 5 `powershell` EventCode=4104 ScriptBlockText IN ("*invoke-wmiexec*") | stats count min(_time) as firstTime max(_time) as lastTime by Computer EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `powershell_invoke_wmiexec_usage_filter`
The SPL above uses the following Macros:
powershell_invoke_wmiexec_usage_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
To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://docs.splunk.com/Documentation/UBA/22.214.171.124/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
Known False Positives
False positives should be limited as this analytic is designed to detect a specific utility. It is recommended to apply appropriate filters as needed to minimize the number of false positives.
Associated Analytic Story
|100.0||100||100||PowerShell was identified running a Invoke-WmiExec on $Computer$.|
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: 1