Potential Persistence Via Microsoft Compatibility Appraiser — Sigma Rule

Rule metadata and linked tags

Author: Sreeman. Source status: test; severity: medium. Source dates: 2020-09-29 / 2023-02-10.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 5ee223d16b9e1c010b14cd9f1637a144259026ded05c2f2633b8d38c1fe4fefa

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: Potential Persistence Via Microsoft Compatibility Appraiser
id: f548a603-c9f2-4c89-b511-b089f7e94549
related:
    - id: 73a883d0-0348-4be4-a8d8-51031c2564f8
      type: derived
status: test
description: |
    Detects manual execution of the "Microsoft Compatibility Appraiser" task via schtasks.
    In order to trigger persistence stored in the "\AppCompatFlags\TelemetryController" registry key.
references:
    - https://www.trustedsec.com/blog/abusing-windows-telemetry-for-persistence/
author: Sreeman
date: 2020-09-29
modified: 2023-02-10
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.persistence
    - attack.t1053.005
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\schtasks.exe'
        - OriginalFileName: 'schtasks.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'run '
            - '\Application Experience\Microsoft Compatibility Appraiser'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.trustedsec.com/blog/abusing-windows-telemetry-for-persistence/