Windows Firewall Disabled via PowerShell

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: Tim Rauch, Elastic (idea)
Source: github.com/SigmaHQ/sigma

Detects attempts to disable the Windows Firewall using PowerShell

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1685` Disable or Modify Tools

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Windows Firewall Disabled via PowerShell
id: 12f6b752-042d-483e-bf9c-915a6d06ad75
related:
    - id: 488b44e7-3781-4a71-888d-c95abfacf44d
      type: similar
status: test
description: Detects attempts to disable the Windows Firewall using PowerShell
references:
    - https://www.elastic.co/guide/en/security/current/windows-firewall-disabled-via-powershell.html
author: Tim Rauch, Elastic (idea)
date: 2022-09-14
modified: 2023-02-13
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection_name:
        - Image|endswith:
              - '\powershell.exe'
              - '\pwsh.exe'
              - '\powershell_ise.exe'
        - OriginalFileName:
              - 'PowerShell.EXE'
              - 'pwsh.dll'
    selection_args:
        CommandLine|contains|all:
            - 'Set-NetFirewallProfile '
            - ' -Enabled '
            - ' False'
    selection_opt:
        CommandLine|contains:
            - ' -All '
            - 'Public'
            - 'Domain'
            - 'Private'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_name`

selection_name:
    - Image|endswith:
          - '\powershell.exe'
          - '\pwsh.exe'
          - '\powershell_ise.exe'
    - OriginalFileName:
          - 'PowerShell.EXE'
          - 'pwsh.dll'

Stage 2: `selection_args`

selection_args:
    CommandLine|contains|all:
        - 'Set-NetFirewallProfile '
        - ' -Enabled '
        - ' False'

Stage 3: `selection_opt`

selection_opt:
    CommandLine|contains:
        - ' -All '
        - 'Public'
        - 'Domain'
        - 'Private'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`-All` `-Enabled` `False` `Domain` corpus 2 (sigma 2) `Private` `Public` `Set-NetFirewallProfile`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\powershell.exe` corpus 179 (sigma 178, kusto 1) `\powershell_ise.exe` corpus 41 (sigma 41) `\pwsh.exe` corpus 165 (sigma 164, kusto 1)	`field:"Image" kind:ends_with`
`OriginalFileName`	eq	`PowerShell.EXE` corpus 138 (sigma 84, splunk 30, elastic 24) `pwsh.dll` corpus 112 (sigma 79, splunk 30, elastic 3)	`field:"OriginalFileName" kind:eq`

Windows Firewall Disabled via PowerShell

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_name

Stage 2: selection_args

Stage 3: selection_opt

Indicators

Stage 0: `condition`

Stage 1: `selection_name`

Stage 2: `selection_args`

Stage 3: `selection_opt`