⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION

We have not been able to test, simulate or build datasets for it, use at your own risk!

Try in Splunk Security Cloud

Description

This search looks for RDP application network traffic and filters any source/destination pair generating more than twice the standard deviation of the average traffic.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Network_Traffic
  • Last Updated: 2020-07-21
  • Author: Jose Hernandez, Splunk
  • ID: a98727cc-286b-4ff2-b898-41df64695923

ATT&CK

ID Technique Tactic
T1021.001 Remote Desktop Protocol Lateral Movement

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Network_Traffic where All_Traffic.app=rdp by All_Traffic.src All_Traffic.dest All_Traffic.dest_port 
| eventstats stdev(count) AS stdev avg(count) AS avg p50(count) AS p50 
| where count>(avg + stdev*2) 
| rename All_Traffic.src AS src All_Traffic.dest AS dest 
| table firstTime lastTime src dest count avg p50 stdev 
| `remote_desktop_network_bruteforce_filter`

Associated Analytic Story

How To Implement

You must ensure that your network traffic data is populating the Network_Traffic data model.

Required field

  • _time
  • All_Traffic.app
  • All_Traffic.src
  • All_Traffic.dest
  • All_Traffic.dest_port

Kill Chain Phase

  • Reconnaissance
  • Delivery

Known False Positives

RDP gateways may have unusually high amounts of traffic from all other hosts' RDP applications in the network.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2