[ GetModuleHandle ]
https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulehandlea

HMODULE GetModuleHandleA(
  LPCSTR lpModuleName
);

[ GetProcAddress ]
https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getprocaddress

FARPROC GetProcAddress(
  HMODULE hModule,
  LPCSTR  lpProcName
);

[ VirtualAlloc ]
https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc

LPVOID VirtualAlloc(
  LPVOID lpAddress,
  SIZE_T dwSize,
  DWORD  flAllocationType,
  DWORD  flProtect
);

HMODULE hModule = GetModuleHandle("Kernel32.dll");
WINAPI * ptrVirtualAlloc = GetProcAddress(hModule, "VirtualAlloc");
ptrVirtualAlloc(  LPVOID lpAddress,  SIZE_T dwSize,  DWORD  flAllocationType,  DWORD  flProtect);