NtWriteVirtualMemory - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTMMAPI_H
// Virtual memory
#if (PHNT_MODE != PHNT_MODE_KERNEL)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtWriteVirtualMemory(
    _In_ HANDLE ProcessHandle,
    _In_opt_ PVOID BaseAddress,
    _In_reads_bytes_(BufferSize) PVOID Buffer,
    _In_ SIZE_T BufferSize,
    _Out_opt_ PSIZE_T NumberOfBytesWritten
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwWriteVirtualMemory(
    _In_ HANDLE ProcessHandle,
    _In_opt_ PVOID BaseAddress,
    _In_reads_bytes_(BufferSize) PVOID Buffer,
    _In_ SIZE_T BufferSize,
    _Out_opt_ PSIZE_T NumberOfBytesWritten
    );

#endif

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NtWriteVirtualMemory is similar to WINAPI WriteProcessMemory. See Ms SDK for detailed description of parameters.

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