// 4. Queue APC PKAPC pApc = (PKAPC)ExAllocatePoolWithTag(NonPagedPool, sizeof(KAPC), 'inj'); KeInitializeApc(pApc, GetThreadFromProcess(TargetProcess), // Target thread (must be alertable) OriginalApcEnvironment, KernelRoutine, UserRoutine, NormalRoutine, UserMode, // User-mode APC (PVOID)RemotePathBuffer);
Kernel-mode DLL injection is a sophisticated technique where a kernel driver (Ring 0) forces a user-mode process (Ring 3) to load a dynamic-link library. This approach is significantly more powerful and stealthy than traditional user-mode injection because it operates at the highest privilege level of the operating system The Core Mechanism kernel dll injector
: Once the process is detected, the driver uses ZwAllocateVirtualMemory to carve out space in the target's memory for the DLL path and the injection shellcode. SIZE_T PathSize = DllPath.Length + sizeof(WCHAR)
KeInsertQueueApc(pApc, pLoadLibraryA, NULL, NULL, 0, NULL); HANDLE hThread = NULL
// Inside DriverDispatch function NTSTATUS KernelInjectDLL(PEPROCESS TargetProcess, UNICODE_STRING DllPath) { PVOID RemotePathBuffer = NULL; SIZE_T PathSize = DllPath.Length + sizeof(WCHAR); HANDLE hThread = NULL; // 1. Allocate memory in target process for DLL path ZwAllocateVirtualMemory(ZwCurrentProcess(), &RemotePathBuffer, 0, &PathSize, MEM_COMMIT, PAGE_READWRITE);