heroui logo

WerFaultSecure Loading DbgCore or DbgHelp - EDR-Freeze

Sigma Rules

View Source
Summary
The detection rule identifies potential misuse of the WerFaultSecure.exe process, specifically when it loads the dbgcore.dll or dbghelp.dll libraries. These libraries are associated with the MiniDumpWriteDump function, which is designed to create a minidump of a process by suspending all threads to ensure a consistent memory snapshot. Attackers exploit the EDR Freeze technique by taking advantage of WerFaultSecure.exe running as a Protected Process Light (PPL) with WinTCB protection, allowing them to suspend security software processes (EDR/AV). This technique creates a window for malicious activities to occur without detection, as processes are frozen and unable to monitor threats during the dump creation. The rule aims to flag these instances to alert security teams of potential evasion tactics being leveraged by adversaries.
Categories
  • Windows
  • Endpoint
Data Sources
  • Process
  • Image
  • Application Log
Created: 2025-11-27