Potential WerFault ReflectDebugger Registry Value Abuse

Hunt Hypothesis

Detects potential WerFault “ReflectDebugger” registry value abuse for persistence.

Detection Rule

Sigma (Original)

title: Potential WerFault ReflectDebugger Registry Value Abuse
id: 0cf2e1c6-8d10-4273-8059-738778f981ad
related:
    - id: fabfb3a7-3ce1-4445-9c7c-3c27f1051cdd
      type: derived
status: test
description: Detects potential WerFault "ReflectDebugger" registry value abuse for persistence.
references:
    - https://cocomelonc.github.io/malware/2022/11/02/malware-pers-18.html
    - https://www.hexacorn.com/blog/2018/08/31/beyond-good-ol-run-key-part-85/
author: X__Junior
date: 2023-05-18
tags:
    - attack.stealth
    - attack.t1036.003
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith: '\Microsoft\Windows\Windows Error Reporting\Hangs\ReflectDebugger'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imRegistry
| where RegistryKey endswith "\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger"

KQL (Microsoft 365 Defender)

DeviceRegistryEvents
| where RegistryKey endswith "\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Technique: T1036.003 — T1036.003

References

• https://cocomelonc.github.io/malware/2022/11/02/malware-pers-18.html
• https://www.hexacorn.com/blog/2018/08/31/beyond-good-ol-run-key-part-85/
• SigmaHQ Rule