[exclusive] - Ntquerywnfstatedata Ntdlldll Better

NtQueryWnfStateData is a native API exported by ntdll.dll that allows user-mode applications to read data associated with a specific WNF state name. Why NtQueryWnfStateData and WNF are "Better" for Research

NTSTATUS NtQueryWnfStateData( _In_ PWNF_STATE_NAME StateName, _In_opt_ PWNF_TYPE_ID TypeId, _In_opt_ const VOID* ExplicitScope, _Out_ PWNF_CHANGE_STAMP ChangeStamp, _Out_writes_bytes_to_opt_(*BufferSize, *BufferSize) PVOID Buffer, _Inout_ PULONG BufferSize ); Use code with caution. ntquerywnfstatedata ntdlldll better

The Windows operating system is a complex and multifaceted environment, with numerous APIs and functions that enable developers to interact with its various components. One such function is NtQueryWnfStateData , a relatively lesser-known API residing in the ntldll.dll library. This write-up aims to provide a comprehensive overview of NtQueryWnfStateData , exploring its purpose, functionality, and potential use cases. NtQueryWnfStateData is a native API exported by ntdll

When user mode calls NtQueryWnfStateData , the following steps occur: One such function is NtQueryWnfStateData , a relatively

NtQueryWnfStateData is an undocumented ntdll.dll function introduced in Windows 8 that allows processes to directly query ("pull") state information from the Windows Notification Facility (WNF). It is favored for system status monitoring and security research, providing immediate access to state data without needing to subscribe to updates. For a technical overview of this function, visit ntdoc.m417z.com NtCreateWnfStateName - NtDoc

First, you need to open the WNF state using NtOpenWnfState (another undocumented function) and then query it.

You might ask: Why not just use the documented GetSystemMetrics or RegNotifyChangeKeyValue ?