win_firewall_as_add_rule.yml

title: Uncommon New Firewall Rule Added In Windows Firewall Exception List
id: cde0a575-7d3d-4a49-9817-b8004a7bf105
status: experimental
description: Detects when a rule has been added to the Windows Firewall exception list
references:
    - https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd364427(v=ws.10)
author: frack113
date: 2022/02/19
modified: 2023/09/09
tags:
    - attack.defense_evasion
    - attack.t1562.004
logsource:
    product: windows
    service: firewall-as
detection:
    selection:
        EventID:
            - 2004 # A rule has been added to the Windows Defender Firewall exception list
            - 2071 # A rule has been added to the Windows Defender Firewall exception list. (Windows 11)
    filter_main_block:
        Action: 2
    filter_main_generic:
        ApplicationPath|contains:
            - ':\Program Files (x86)\'
            - ':\Program Files\'
            - ':\Windows\System32\'
            - ':\Windows\SysWOW64\'
            - ':\Windows\WinSxS\'
    filter_optional_msmpeng:
        ModifyingApplication|contains|all:
            - ':\ProgramData\Microsoft\Windows Defender\Platform\'
            - '\MsMpEng.exe'
    filter_main_covered_paths:
        # This filter is added to avoid duplicate alerting from 9e2575e7-2cb9-4da1-adc8-ed94221dca5e
        ApplicationPath|contains:
            - ':\PerfLogs\'
            - ':\Temp\'
            - ':\Users\Public\'
            - ':\Windows\Tasks\'
            - ':\Windows\Temp\'
            - '\AppData\Local\Temp\'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
level: medium