this detection focuses on tor-related processes and may generate benign matches in environments where tor is intentionally used, such as security testing, research, or lab environments.

Techniques

T1090.003

Sample rules

Windows TOR Client Execution

source: splunk
technicques:
- T1090.003

Description

The following analytic detects the execution of the TOR Browser and related TOR components on Windows endpoints by monitoring process creation activity. Adversaries and insider threats leverage TOR to anonymize command-and-control traffic, facilitate data exfiltration, and evade network monitoring and policy enforcement. While TOR can be used for legitimate research and privacy purposes, its presence on enterprise endpoints is often unusual and should be investigated to determine intent, scope, and any associated malicious behavior.

Detection logic


| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime
  from datamodel=Endpoint.Processes where
  (
    Processes.process_name = "tor.exe"
    OR
    (
      Processes.process_path = "*\\BraveSoftware\\Brave-Browser*"
      Processes.process_path = "*\\tor-*"
    )
  )
  by Processes.action Processes.dest Processes.original_file_name
     Processes.parent_process Processes.parent_process_exec
     Processes.parent_process_guid Processes.parent_process_id
     Processes.parent_process_name Processes.parent_process_path
     Processes.process Processes.process_exec Processes.process_guid
     Processes.process_hash Processes.process_id Processes.process_integrity_level
     Processes.process_name Processes.process_path Processes.user
     Processes.user_id Processes.vendor_product

| `drop_dm_object_name(Processes)`

| `security_content_ctime(firstTime)`

| `security_content_ctime(lastTime)`

| `windows_tor_client_execution_filter`