Firewall Disabled via Netsh.EXE — Sigma Rule

Rule metadata and linked tags

Author: Fatih Sirin. Source status: test; severity: medium. Source dates: 2019-11-01 / 2023-02-13.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: e419e1827c805293b0d6291d6c7b019f4a05944e08e4ef167f068c930e25e2ef

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Firewall Disabled via Netsh.EXE
id: 57c4bf16-227f-4394-8ec7-1b745ee061c3
status: test
description: Detects netsh commands that turns off the Windows firewall
references:
    - https://www.winhelponline.com/blog/enable-and-disable-windows-firewall-quickly-using-command-line/
    - https://app.any.run/tasks/210244b9-0b6b-4a2c-83a3-04bd3175d017/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.004/T1562.004.md#atomic-test-1---disable-microsoft-defender-firewall
author: Fatih Sirin
date: 2019-11-01
modified: 2023-02-13
tags:
    - attack.defense-impairment
    - attack.t1686.003
    - attack.s0108
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\netsh.exe'
        - OriginalFileName: 'netsh.exe'
    selection_cli_1:
        # Example: netsh firewall set opmode disable
        CommandLine|contains|all:
            - 'firewall'
            - 'set'
            - 'opmode'
            - 'disable'
    selection_cli_2:
        # Example: netsh advfirewall set currentprofile state off
        CommandLine|contains|all:
            - 'advfirewall'
            - 'set'
            - 'state'
            - 'off'
    condition: selection_img and 1 of selection_cli_*
falsepositives:
    - Legitimate administration activity
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate administration activity

Source references

• https://www.winhelponline.com/blog/enable-and-disable-windows-firewall-quickly-using-command-line/
• https://app.any.run/tasks/210244b9-0b6b-4a2c-83a3-04bd3175d017/
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.004/T1562.004.md#atomic-test-1---disable-microsoft-defender-firewall