The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the execution of the
Get-WmiObject commandlet. The
DS_User class parameter leverages WMI to query for all domain users. Red Teams and adversaries may leverage this commandlet to enumerate domain users for situational awareness and Active Directory Discovery.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2022-05-02
- Author: Teoderick Contreras, Mauricio Velazco, Splunk
- ID: fabd364e-04f3-11ec-b34b-acde48001122
Kill Chain Phase
- CIS 10
1 2 3 4 5 `powershell` EventCode=4104 ScriptBlockText = "*get-wmiobject*" ScriptBlockText = "*ds_user*" ScriptBlockText = "*-namespace*" ScriptBlockText = "*root\\directory\\ldap*" | stats count min(_time) as firstTime max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `getwmiobject_ds_user_with_powershell_script_block_filter`
The SPL above uses the following Macros:
getwmiobject_ds_user_with_powershell_script_block_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
he following Hunting analytic requires PowerShell operational logs to be imported. Modify the powershell macro as needed to match the sourcetype or add index. This analytic is specific to 4104, or PowerShell Script Block Logging.
Known False Positives
Administrators or power users may use this command for troubleshooting.
Associated Analytic Story
|25.0||50||50||powershell process having commandline $ScriptBlockText$ for user enumeration|
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: 2