New Firewall Rule Added In Windows Firewall Exception List For Potential Suspicious Application — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2023-02-26 / 2024-05-10.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: dcca562a224fbbb30109ccf24c4a779e5101aabad57b90426c88aaf9257e6951

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: New Firewall Rule Added In Windows Firewall Exception List For Potential Suspicious Application
id: 9e2575e7-2cb9-4da1-adc8-ed94221dca5e
related:
    - id: cde0a575-7d3d-4a49-9817-b8004a7bf105
      type: derived
status: test
description: Detects the addition of a new rule to the Windows Firewall exception list for an application located in a potentially suspicious location.
references:
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd364427(v=ws.10)
    - https://app.any.run/tasks/7123e948-c91e-49e0-a813-00e8d72ab393/#
author: frack113
date: 2023-02-26
modified: 2024-05-10
tags:
    - attack.defense-impairment
    - attack.t1686.003
logsource:
    product: windows
    service: firewall-as
detection:
    selection:
        EventID:
            - 2004 # A rule has been added to the Windows Defender Firewall exception list. (Windows 10)
            - 2071 # A rule has been added to the Windows Defender Firewall exception list. (Windows 11)
            - 2097
        ApplicationPath|contains:
            - ':\PerfLogs\'
            - ':\Temp\'
            - ':\Tmp\'
            - ':\Users\Public\'
            - ':\Windows\Tasks\'
            - ':\Windows\Temp\'
            - '\AppData\Local\Temp\'
    filter_main_block:
        Action: 2 # Block
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-r2-and-2008/dd364427(v=ws.10)
• https://app.any.run/tasks/7123e948-c91e-49e0-a813-00e8d72ab393/#