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This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Is it good to use ntdll.dll in a win32 console application?
On success, the function returns STATUS_SUCCESS (which is 0x00000000). The macro NT_SUCCESS(Status) is commonly used to check for success, as it returns TRUE for any status code that is >= 0 . The Buffer will then contain the raw data, and the BufferSize output value will indicate the size of that data.
If you are a user trying to optimize your PC because apps are crashing due to ntdll.dll errors, the problem typically roots down to third-party software injecting corrupted data hooks into the native API layer. ntquerywnfstatedata ntdlldll better
Because the prototype is not in the standard Windows headers, you must dynamically link to the function using GetProcAddress . The standard pattern is robust and well-established:
Microsoft may change the behavior, parameters, or even remove the export in a future update. Your code could break after a Windows patch. This public link is valid for 7 days
#include #include // Manually define the return structure of NTSTATUS #define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0) typedef NTSTATUS(NTAPI* _NtQueryWnfStateData)( PULONG64 StateName, PVOID TypeId, PVOID ExplicitScope, PULONG ChangeSequenceNumber, PVOID Buffer, PULONG BufferLength ); int main() // 1. Get a handle to the native NT layer module HMODULE hNtdll = GetModuleHandleA("ntdll.dll"); if (!hNtdll) std::cerr << "[-] Failed to secure handle on ntdll.dll" << std::endl; return -1; // 2. Extract the procedure address dynamically _NtQueryWnfStateData NtQueryWnfStateData = (_NtQueryWnfStateData)GetProcAddress(hNtdll, "NtQueryWnfStateData"); if (!NtQueryWnfStateData) std::cerr << "[-] Failed to map NtQueryWnfStateData memory offset" << std::endl; return -1; // 3. Define a target WNF State Name (Example: Well-known Windows State Name) // Note: Replace with a real target State Name identifier hex for deployment ULONG64 TargetStateName = 0x41C64E6DA3BC1C75; ULONG ChangeSequenceNumber = 0; BYTE DataBuffer[256] = 0 ; ULONG BufferLength = sizeof(DataBuffer); // 4. Query the live kernel-backed WNF data block NTSTATUS status = NtQueryWnfStateData( &TargetStateName, NULL, NULL, &ChangeSequenceNumber, DataBuffer, &BufferLength ); // 5. Evaluate the Native API return status code if (NT_SUCCESS(status)) std::cout << "[+] Query Successful!" << std::endl; std::cout << "[+] Change Sequence: " << ChangeSequenceNumber << std::endl; std::cout << "[+] Data Bytes Returned: " << BufferLength << std::endl; else std::cerr << "[-] Native Call Failed with NTSTATUS Error: 0x" << std::hex << status << std::endl; return 0; Use code with caution. ⚠️ Stability Risks and Best Practices
: By bypassing the Kernel32 or User32 layers, you reduce the instruction path. This is critical for high-frequency monitoring tools or lightweight background agents. Can’t copy the link right now
The WNF_STATE_NAME structure must be packed exactly as the kernel expects. Most compilers handle this automatically, but explicit #pragma pack directives can prevent subtle alignment bugs.
Security researchers and malware analysts have started using NtQueryWnfStateData to detect sandboxes and virtual machines. Some VM platforms fail to properly implement WNF notifications, so querying a system-derived WNF state (like the boot timestamp) can reveal inconsistencies.
int main() HMODULE hNtdll = GetModuleHandleW(L"ntdll.dll"); if (!hNtdll) std::cerr << "Failed to get ntdll.dll handle." << std::endl; return 1;
This article explores what NtQueryWnfStateData is, why it is considered "better" than traditional approaches for specific use cases, and the technical considerations for its usage. What is NtQueryWnfStateData?