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Processes launching netsh	Disable or Modify System Firewall, Impair Defenses	Endpoint	2021-09-16	true		Disable or Modify System Firewall Defense Evasion Impair Defenses Defense Evasion Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This search looks for processes launching netsh.exe. Netsh is a command-line scripting utility that allows you to, either locally or remotely, display or modify the network configuration of a computer that is currently running. Netsh can be used as a persistence proxy technique to execute a helper DLL when netsh.exe is executed. In this search, we are looking for processes spawned by netsh.exe and executing commands via the command line.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-09-16
• Author: Michael Haag, Josef Kuepker, Splunk
• ID: b89919ed-fe5f-492c-b139-95dbb162040e

ATT&CK

ID	Technique	Tactic
T1562.004	Disable or Modify System Firewall	Defense Evasion

| T1562 | Impair Defenses | Defense Evasion |

Search

| tstats `security_content_summariesonly` count values(Processes.process) AS Processes.process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_netsh` by Processes.parent_process_name Processes.parent_process Processes.original_file_name Processes.process_name Processes.user Processes.dest 
|`drop_dm_object_name("Processes")` 
|`security_content_ctime(firstTime)` 
|`security_content_ctime(lastTime)` 
|`processes_launching_netsh_filter`

Associated Analytic Story

• Netsh Abuse
• Disabling Security Tools
• DHS Report TA18-074A

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. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.

Required field

• _time
• Processes.process
• Processes.parent_process_name
• Processes.parent_process
• Processes.process_name
• Processes.user
• Processes.dest

Kill Chain Phase

• Actions on Objectives

Known False Positives

Some VPN applications are known to launch netsh.exe. Outside of these instances, it is unusual for an executable to launch netsh.exe and run commands.

RBA

Risk Score	Impact	Confidence	Message
42.0	60	70	A process process_name that tries to execute netsh commandline process in host dest

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.004/atomic_red_team/windows-sysmon.log

source | version: 4