Try in Splunk Security Cloud

Description

This analytic looks for the execution of nltest.exe with command-line arguments utilized to discover remote systems. The arguments /dclist: and '/dsgetdc:', can be used to return a list of all domain controllers. Red Teams and adversaries alike may use nltest.exe to identify domain controllers in a Windows Domain for situational awareness and Active Directory Discovery.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2021-08-30
  • Author: Mauricio Velazco, Splunk
  • ID: 41243735-89a7-4c83-bcdd-570aa78f00a1

ATT&CK

ID Technique Tactic
T1018 Remote System Discovery Discovery

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name="nltest.exe") (Processes.process="*/dclist:*" OR Processes.process="*/dsgetdc:*") by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `domain_controller_discovery_with_nltest_filter`

Associated Analytic Story

How To Implement

To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the Endpoint datamodel in the Processes node.

Required field

  • Processes.dest
  • Processes.user
  • Processes.parent_process_name
  • Processes.parent_process
  • Processes.original_file_name
  • Processes.process_name
  • Processes.process
  • Processes.process_id
  • Processes.parent_process_path
  • Processes.process_path
  • Processes.parent_process_id

Kill Chain Phase

  • Reconnaissance

Known False Positives

Administrators or power users may use this command for troubleshooting.

RBA

Risk Score Impact Confidence Message
21.0 30 70 Domain controller discovery on $dest$ by $user$

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: 1