Suspicious Application Allowed Through Exploit Guard — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-08-05 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 75929dea3c68d9854206555592db1a9870ecc8180b57ce7a2db796107fe084f0

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: Suspicious Application Allowed Through Exploit Guard
id: 42205c73-75c8-4a63-9db1-e3782e06fda0
status: test
description: Detects applications being added to the "allowed applications" list of exploit guard in order to bypass controlled folder settings
references:
    - https://www.microsoft.com/security/blog/2017/10/23/windows-defender-exploit-guard-reduce-the-attack-surface-against-next-generation-malware/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-05
modified: 2023-08-17
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: registry_set
    product: windows
detection:
    selection_key:
        TargetObject|contains: 'SOFTWARE\Microsoft\Windows Defender\Windows Defender Exploit Guard\Controlled Folder Access\AllowedApplications'
    selection_paths:
        TargetObject|contains:
            # Add more paths you don't allow in your org
            - '\Users\Public\'
            - '\AppData\Local\Temp\'
            - '\Desktop\'
            - '\PerfLogs\'
            - '\Windows\Temp\'
    condition: all of selection_*
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://www.microsoft.com/security/blog/2017/10/23/windows-defender-exploit-guard-reduce-the-attack-surface-against-next-generation-malware/