sigmalowHunting

New Windows Firewall Rule Added Via New-NetFirewallRule Cmdlet

Detects calls to the "New-NetFirewallRule" cmdlet from PowerShell in order to add a new firewall rule with an "Allow" action.

MITRE ATT&CK

T1562.004

defense-evasion

Detection Query

selection_name:
  - Image|endswith:
      - \powershell.exe
      - \pwsh.exe
      - \powershell_ise.exe
  - OriginalFileName:
      - PowerShell.EXE
      - pwsh.dll
selection_args:
  CommandLine|contains|all:
    - "New-NetFirewallRule "
    - " -Action "
    - allow
condition: all of selection_*

Author

frack113

Created

2024-05-03

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1562.004detection.threat-hunting

Raw Content

title: New Windows Firewall Rule Added Via New-NetFirewallRule Cmdlet
id: 51483085-0cba-46a8-837e-4416496d6971
related:
    - id: 8d31dd2e-b582-48ca-826e-dcaa2c1ca264
      type: similar
status: test
description: |
    Detects calls to the "New-NetFirewallRule" cmdlet from PowerShell in order to add a new firewall rule with an "Allow" action.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.004/T1562.004.md#atomic-test-24---set-a-firewall-rule-using-new-netfirewallrule
    - https://malware.news/t/the-rhysida-ransomware-activity-analysis-and-ties-to-vice-society/72170
    - https://cybersecuritynews.com/rhysida-ransomware-attacking-windows/
author: frack113
date: 2024-05-03
tags:
    - attack.defense-evasion
    - attack.t1562.004
    - detection.threat-hunting
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:
            - 'New-NetFirewallRule '
            - ' -Action '
            - 'allow'
    condition: all of selection_*
falsepositives:
    - Administrator script
level: low