NtWriteVirtualMemory

[DllImport("ntdll.dll", ExactSpelling = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe NTSTATUS NtWriteVirtualMemory(
    HANDLE ProcessHandle,
    void* BaseAddress,
    void* Buffer,
    uint NumberOfBytesToWrite,
    [Optional] uint* NumberOfBytesWritten);