Name:Execution of File With Spaces Before Extension id:ab0353e6-a956-420b-b724-a8b4846d5d5a version:5 date:2024-10-17 author:Rico Valdez, Splunk status:deprecated type:TTP Description:This search looks for processes launched from files with at least five spaces in the name before the extension. This is typically done to obfuscate the file extension by pushing it outside of the default view. Data_source:
-Sysmon EventID 1
search:| tstats `security_content_summariesonly` count values(Processes.process_path) as process_path min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process = "* .*" by Processes.dest Processes.user Processes.process Processes.process_name | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)` | `drop_dm_object_name(Processes)` | `execution_of_file_with_spaces_before_extension_filter`
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:None identified. References: drilldown_searches:
: tags: analytic_story: - 'Windows File Extension and Association Abuse' - 'Masquerading - Rename System Utilities' asset_type:Endpoint confidence:50 impact:50 message:tbd mitre_attack_id: - 'T1036.003' observable: name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'Processes.process_path' - 'Processes.process' - 'Processes.dest' - 'Processes.user' - 'Processes.process_name' risk_score:25 security_domain:endpoint
