Name:Remote Desktop Process Running On System id:f5939373-8054-40ad-8c64-cec478a22a4a version:7 date:2024-10-17 author:David Dorsey, Splunk status:experimental type:Hunting Description:The following analytic detects the execution of the remote desktop process (mstsc.exe) on systems where it is not typically run. This detection leverages data from Endpoint Detection and Response (EDR) agents, filtering out systems categorized as common RDP sources. This activity is significant because unauthorized use of mstsc.exe can indicate lateral movement or unauthorized remote access attempts. If confirmed malicious, this could allow an attacker to gain remote control of a system, potentially leading to data exfiltration, privilege escalation, or further network compromise. Data_source:
-Sysmon EventID 1
-Windows Event Log Security 4688
-CrowdStrike ProcessRollup2
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process=*mstsc.exe AND Processes.dest_category!=common_rdp_source by Processes.dest Processes.user Processes.process | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)` | `drop_dm_object_name(Processes)` | `remote_desktop_process_running_on_system_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:Remote Desktop may be used legitimately by users on the network. References: drilldown_searches:
: tags: analytic_story: - 'Hidden Cobra Malware' - 'Active Directory Lateral Movement' asset_type:Endpoint confidence:50 impact:50 message:tbd mitre_attack_id: - 'T1021.001' - 'T1021' observable: name:'user' type:'User' - role: - 'Victim' name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'Processes.process' - 'Processes.dest_category' - 'Processes.dest' - 'Processes.user' risk_score:25 security_domain:endpoint
