Suspicious Firewall Rule Deleted Through Netsh.EXE (via process_creation)

title: Suspicious Firewall Rule Deleted Through Netsh.EXE (via process_creation)
id: 889a0021-a821-5a92-8a3f-b07d1f20080d
status: stable
description: This rule detects the removal of a port or application rule in the Windows Firewall configuration using netsh
references:
    - https://attack.mitre.org/techniques/T1686/003/
    - https://app.any.run/tasks/8bbd5b4c-b82d-4e6d-a3ea-d454594a37cc/
author: Huntrule Team
date: 2026-01-23
tags:
    - attack.defense-impairment
    - attack.t1686.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\netsh.exe'
        - OriginalFileName: 'netsh.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'firewall'
            - 'delete '
    filter_optional_dropbox:
        ParentImage|endswith: '\Dropbox.exe'
        CommandLine|contains: 'name=Dropbox'
    filter_optional_avast:
        ParentImage|endswith: '\instup.exe'
        CommandLine|contains: 'advfirewall firewall delete rule name="Avast Antivirus Admin Client"'
    condition: all of selection_* and not 1 of filter_optional_*
falsepositives:
    - Unknown
level: medium