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Detections against ShieldBreak exploitation attempt - #4222

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nasbench merged 9 commits into
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shieldbreak_detections
Aug 20, 2026
Merged

Detections against ShieldBreak exploitation attempt#4222
nasbench merged 9 commits into
developfrom
shieldbreak_detections

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@onurmerdogan

@onurmerdogan onurmerdogan commented Aug 17, 2026

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Details

New exploit targeting Windows Defender remediation process was published under ShieldBreak alias, below content was added to cover its detection.

Stories

  • Rogue Planet: Updated existing story with the new exploit information

Data sources

  • Windows Event Log Defender 1116: Added "Malware Detection" events from Windows Defender
  • Windows Event Log Defender 1117: Added "Remediation action taken" events from Windows Defender

Detections

  • Windows Alternate Data Stream Created Over Local Share: The following analytic detects the creation of an NTFS alternate data stream (ADS) accessed over a local administrative share targeting the loopback address.
  • Windows Defender MpClient.dll Loaded by Non-Defender Process: The following analytic detects mpclient.dll, the Windows Defender client API library, being loaded by a process that is not part of the Windows Defender platform.
  • Windows Defender Threat Detected on Kernel Object Path: The following analytic detects a Windows Defender malware detection or remediation event where the scanned path resolves through the NT object manager namespace.
  • Windows Error Report Created in ReportQueue Manually: The following analytic detects a .wer file being written into the Windows Error Reporting ReportQueue directory by a process other than the standard error-reporting binaries.
  • Windows Phantom DLL Created on Disk: The following analytic detects the creation of a phantom DLL files on disk.
  • Windows Wermgr Spawning System Integrity Process: The following analytic detects wermgr.exe (Windows Error Reporting) spawning a child process running at SYSTEM integrity level.

Comment thread detections/endpoint/windows_defender_threat_detected_on_kernel_object_path.yml Outdated

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Looks Great! Thanks for putting the PR.

I made some slight changes to the metadata/logic that you can find in 5439ef0

@nasbench
nasbench merged commit a2f99be into develop Aug 20, 2026
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@nasbench
nasbench deleted the shieldbreak_detections branch August 20, 2026 14:28
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3 participants