Windows API

Name	Brief	Stages	Sample Code
NtVirtualAllocX	Important API for memory allocation	Memory Management	VirtualAllocEx();
NtCreateFile	Important API for file creation	File Operations	CreateFile();
NtReadFile	Important API for reading files	File Operations	ReadFile();
NtTerminateProcess	Important API for ending processes	Process Management	TerminateProcess();
NtOpenProcess	Important API for accessing processes	Process Management	OpenProcess();
NtQuerySystemInformation	Important API for system info retrieval	System Monitoring	GetSystemInfo();
NtQueryDirectoryFile	Important API for directory queries	File Operations	FindFirstFile();
NtOpenThread	Important API for accessing threads	Thread Management	OpenThread();
NtSetInformationFile	Important API for file info modification	File Operations	SetFileInformationByHandle();
NtQueryInformationProcess	Important API for process info retrieval	Process Monitoring	GetProcessInformation();
NtAllocateVirtualMemory	Important API for virtual memory allocation	Memory Management	VirtualAlloc();
NtFreeVirtualMemory	Important API for virtual memory release	Memory Management	VirtualFree();
NtWriteFile	Important API for writing to files	File Operations	WriteFile();
NtClose	Important API for closing handles	Handle Management	CloseHandle();
NtDelayExecution	Important API for thread delays	Thread Management	Sleep();
NtQueryKey	Important API for querying registry keys	Registry Operations	RegQueryValueEx();
NtSetValueKey	Important API for setting registry values	Registry Operations	RegSetValueEx();
NtOpenKey	Important API for opening registry keys	Registry Operations	RegOpenKeyEx();
NtQueryValueKey	Important API for querying registry values	Registry Operations	RegQueryValueEx();
NtEnumerateValueKey	Important API for enumerating registry values	Registry Operations	RegEnumValue();
NtProtectVirtualMemory	Important API for memory protection	Memory Management	VirtualProtect();
NtDuplicateObject	Important API for duplicating handles	Handle Management	DuplicateHandle();
NtAdjustPrivilegesToken	Important API for adjusting token privileges	Security Management	AdjustTokenPrivileges();
NtLoadDriver	Important API for loading device drivers	Driver Operations	LoadDriver();
NtUnloadDriver	Important API for unloading device drivers	Driver Operations	UnloadDriver();
NtMapViewOfSection	Important API for mapping view of a section	Memory Management	MapViewOfFile();
NtUnmapViewOfSection	Important API for unmapping view of a section	Memory Management	UnmapViewOfFile();
NtQueryVolumeInformationFile	Important API for querying volume information	File Operations	GetVolumeInformation();
NtDeviceIoControlFile	Important API for device I/O control	Device Operations	DeviceIoControl();
NtWaitForSingleObject	Important API for waiting on an object	Synchronization	WaitForSingleObject();
NtWaitForMultipleObjects	Important API for waiting on multiple objects	Synchronization	WaitForMultipleObjects();
NtSetEvent	Important API for setting an event	Synchronization	SetEvent();
NtResetEvent	Important API for resetting an event	Synchronization	ResetEvent();
NtCreateMutant	Important API for creating a mutex	Synchronization	CreateMutex();
NtReleaseMutant	Important API for releasing a mutex	Synchronization	ReleaseMutex();
NtSuspendThread	Important API for suspending threads	Thread Management	SuspendThread();
NtResumeThread	Important API for resuming threads	Thread Management	ResumeThread();
NtSetInformationThread	Important API for setting thread information	Thread Management	SetThreadInformation();
NtQueryPerformanceCounter	Important API for performance counter queries	Performance Monitoring	QueryPerformanceCounter();
NtQuerySemaphore	Important API for querying semaphore	Synchronization	QuerySemaphore();
NtSetTimer	Important API for setting timers	Timer Operations	SetWaitableTimer();
NtCancelTimer	Important API for canceling timers	Timer Operations	CancelWaitableTimer();