Windows Defender Exploit Guard Tamper — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-08-05 / 2022-12-06.

{
  "product": "windows",
  "service": "windefend"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7aca173643418f94faeffe1863bdb1c6743bdbcf9b758eb9d1d7b495471ac36c

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: Windows Defender Exploit Guard Tamper
id: a3ab73f1-bd46-4319-8f06-4b20d0617886
status: test
description: |
    Detects when someone is adding or removing applications or folders from exploit guard "ProtectedFolders" or "AllowedApplications"
references:
    - https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/windows-10-controlled-folder-access-event-search/ba-p/2326088
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-05
modified: 2022-12-06
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    service: windefend
detection:
    allowed_apps_key:
        EventID: 5007 # The antimalware platform configuration changed.
        NewValue|contains: '\Windows Defender\Windows Defender Exploit Guard\Controlled Folder Access\AllowedApplications\'
    allowed_apps_path:
        NewValue|contains:
            # Add more paths you don't allow in your org
            - '\Users\Public\'
            - '\AppData\Local\Temp\'
            - '\Desktop\'
            - '\PerfLogs\'
            - '\Windows\Temp\'
    protected_folders:
        EventID: 5007 # The antimalware platform configuration changed.
        # This will trigger on any folder removal. If you experience FP's then add another selection with specific paths
        OldValue|contains: '\Windows Defender\Windows Defender Exploit Guard\Controlled Folder Access\ProtectedFolders\'
    condition: all of allowed_apps* or protected_folders
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/windows-10-controlled-folder-access-event-search/ba-p/2326088