Elastic Security Detection Rules

Werfault ReflectDebugger Persistence

Last updated a month ago on 2025-08-26
Created 2 years ago on 2023-08-29

About

Identifies the registration of a Werfault Debugger. Attackers may abuse this mechanism to execute malicious payloads every time the utility is executed with the "-pr" parameter.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: PersistenceData Source: Elastic EndgameData Source: Elastic DefendData Source: Microsoft Defender for EndpointData Source: SentinelOneData Source: SysmonData Source: CrowdstrikeLanguage: eql
Severity
low
Risk Score
21
MITRE ATT&CK™

Persistence (TA0003)(opens in a new tab or window)

↳ Event Triggered Execution (T1546)(opens in a new tab or window)

Defense Evasion (TA0005)(opens in a new tab or window)

↳ Modify Registry (T1112)(opens in a new tab or window)

License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
logs-endpoint.events.registry-*endgame-*logs-m365_defender.event-*logs-sentinel_one_cloud_funnel.*logs-windows.sysmon_operational-*logs-crowdstrike.fdr*
Related Integrations

endpoint(opens in a new tab or window)

m365_defender(opens in a new tab or window)

sentinel_one_cloud_funnel(opens in a new tab or window)

windows(opens in a new tab or window)

crowdstrike(opens in a new tab or window)

Query
registry where host.os.type == "windows" and event.type == "change" and
  registry.value : "ReflectDebugger"

  /*
    Full registry key path omitted due to data source variations:
    HKLM\\Software\\Microsoft\\Windows\\Windows Error Reporting\\Hangs\\ReflectDebugger
  */

Install detection rules in Elastic Security

Detect Werfault ReflectDebugger Persistence in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).