EDR-Preloading is a technique to bypass Endpoint Detection and Response (EDR) user-mode hooks by executing malicious code before the EDR's DLL loads into a process. By exploiting the AppVerifier layer in ntdll — specifically the AvrfpAPILookupCallbackRoutine pointer — an attacker can register a callback that fires during early
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A quick overview of the Windows process loaderOlder bypass techniques and drawbacksFinding something newIntroducing EDR-PreloaderFinal ThoughtsSort: