some legitimate developers may use microsoft devtunnels for testing and debugging their applications. filter alerts for approved development environments and users.

Techniques

T1090

Sample rules

Windows Devtunnels Execution

source: splunk
technicques:
- T1090

Description

Detects the execution of Microsoft devtunnels.exe. Microsoft Devtunnels is a feature within Visual Studio that allows developers to expose their local development environment to the internet via secure, temporary tunnels, enabling external access for testing webhooks, APIs, and other services. While designed for legitimate development purposes, an attacker could exploit this feature to expose a compromised system or service to the internet, creating a covert communication channel that bypasses network security measures. By using Dev Tunnels, the attacker can establish a remote connection to the compromised environment, facilitate data exfiltration, or maintain command-and-control communications while avoiding detection by blending their activities with legitimate development traffic.

Detection logic


| tstats `security_content_summariesonly`
  count min(_time) as firstTime
        max(_time) as lastTime

from datamodel=Endpoint.Processes where

Processes.original_file_name="devtunnel.dll"
OR
Processes.process_name="devtunnel.exe"

by Processes.process Processes.vendor_product Processes.user_id Processes.process_hash
   Processes.parent_process_name Processes.parent_process_exec Processes.action
   Processes.dest Processes.process_current_directory Processes.process_path
   Processes.process_integrity_level Processes.original_file_name Processes.parent_process
   Processes.parent_process_path Processes.parent_process_guid Processes.parent_process_id
   Processes.process_guid Processes.process_id Processes.user Processes.process_name


| `drop_dm_object_name(Processes)`

| `security_content_ctime(firstTime)`

| `security_content_ctime(lastTime)`

| `windows_devtunnels_execution_filter`