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Remote Desktop Network Traffic

The following analytic detects unusual Remote Desktop Protocol (RDP) traffic on TCP/3389 by filtering out known RDP sources and destinations, focusing on atypical connections within the network. This detection leverages network traffic data to identify potentially unauthorized RDP access. Monitoring this activity is crucial for a SOC as unauthorized RDP access can indicate an attacker's attempt to control networked systems, leading to data theft, ransomware deployment, or further network compromise. If confirmed malicious, this activity could result in significant data breaches or complete system and network control loss.

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Detection Logic

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime 
FROM datamodel=Network_Traffic
  
WHERE All_Traffic.dest_port=3389
    
AND
    All_Traffic.dest_category!=common_rdp_destination
    
AND
    All_Traffic.src_category!=common_rdp_source
    
AND
    All_Traffic.action="allowed"
  BY All_Traffic.src All_Traffic.dest All_Traffic.dest_port
     All_Traffic.dest_ip All_Traffic.dvc All_Traffic.src_ip
     All_Traffic.src_port All_Traffic.vendor_product
| `drop_dm_object_name("All_Traffic")`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `remote_desktop_network_traffic_filter`

False Positives

⚠ Remote Desktop may be used legitimately by users on the network.

Field Validations

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