A Rule Has Been Deleted From The Windows Firewall Exception List — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2022-02-19 / 2024-08-29.

{
  "product": "windows",
  "service": "firewall-as"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: a6a76b4c8b847bdd8f04168540a49f9e2fe4dd09c32b246b870f0ab9ce2616b6

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: A Rule Has Been Deleted From The Windows Firewall Exception List
id: c187c075-bb3e-4c62-b4fa-beae0ffc211f
status: test
description: Detects when a single rules or all of the rules have been deleted from the Windows Defender Firewall
references:
    - https://learn.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: 2024-08-29
tags:
    - attack.defense-impairment
    - attack.t1686.003
logsource:
    product: windows
    service: firewall-as
detection:
    selection:
        EventID:
            - 2006 # A rule has been deleted in the Windows Defender Firewall exception list
            - 2052 # A rule has been deleted in the Windows Defender Firewall exception list. (Windows 11)
    filter_main_generic:
        ModifyingApplication|startswith:
            - 'C:\Program Files (x86)\'
            - 'C:\Program Files\'
            - 'C:\Windows\WinSxS\'
    filter_main_svchost:
        ModifyingApplication: 'C:\Windows\System32\svchost.exe'
    filter_optional_msmpeng:
        ModifyingApplication|startswith: 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
        ModifyingApplication|endswith: '\MsMpEng.exe'
    filter_main_null:
        ModifyingApplication: null
    filter_main_empty:
        ModifyingApplication: ''
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
level: medium

Original YAML and metadata in JSON

False positives

No reviewed association in this snapshot.

Source references

• https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd364427(v=ws.10)