The following analytic identifies modification of Windows registry using regedit.exe application with silent mode parameter. regedit.exe windows application is commonly used as GUI app to check or modify registry. This application is also has undocumented command-line parameter and one of those are silent mode parameter that performs action without stopping for confirmation with dialog box. Importing registry from .reg files need to monitor in a production environment since it can be used adversaries to import RMS registry in compromised host.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2022-06-24
- Author: Teoderick Contreras, Splunk
- ID: 824dd598-71be-4203-bc3b-024f4cda340e
Kill Chain Phase
- CIS 10
1 2 3 4 5 6 | tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="regedit.exe" OR Processes.original_file_name="regedit.exe") AND Processes.process="* /s *" AND Processes.process="*.reg*" by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_modify_registry_regedit_silent_reg_import_filter`
The SPL above uses the following Macros:
windows_modify_registry_regedit_silent_reg_import_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
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
Administrators may execute this command that may cause some false positive. Filter as needed.
Associated Analytic Story
|49.0||70||70||The regedit app was executed with silet mode parameter to import .reg file on $dest$.|
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: 1