The following analytic detects a powershell script that enumerate camera mounted to the targeted host. This technique was seen in DCRat malware, where it runs a powershell command to look for camera information that will be pass on to its C2 server. This anomaly detection can be a good pivot to check who and why this enumeration is needed and what parent process execute this powershell script command.
- Type: Anomaly
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-11-07
- Author: Teoderick Contreras, Splunk
- ID: e4df4676-ea41-4397-b160-3ee0140dc332
Kill Chain Phase
- CIS 10
1 2 3 4 5 6 7 `powershell` EventCode=4104 ScriptBlockText= "* Win32_PnPEntity *" ScriptBlockText= "*SELECT*" ScriptBlockText= "*WHERE*" ScriptBlockText = "*PNPClass*" ScriptBlockText IN ("*Image*", "*Camera*") | stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer UserID | rename Computer as dest | rename UserID as user | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_gather_victim_host_information_camera_filter`
The SPL above uses the following Macros:
windows_gather_victim_host_information_camera_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/126.96.36.199/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
Known False Positives
Administrators may execute this powershell command to get hardware information related to camera on $dest$.
Associated Analytic Story
|42.0||60||70||powershell script $ScriptBlockText$ to enumerate camera in $Computer$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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