research poc
EDR Bypass via AVRF Callback Hijacking and NTDLL Hooking in C#AVRF-Callback-EDR-Bypass
Researchers from W2H Corp. published a proof-of-concept technique that bypasses EDR by hijacking the AvrfpAPILookupCallbackRoutine callback in ntdll.dll during early process initialization, before the EDR DLL loads. The method uses C# and .NET 8 to inject shellcode and hook functions like LdrLoadDll, neutralizing all major EDR solutions. This pre-monitoring phase exploitation allows attackers to run code undetected.