Abusing callback to run shellcode.
Eksekusi shellcode dengan CallWindowProc.
LRESULT CallWindowProcA (WNDPROC lpPrevWndFunc, HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
LRESULT CallWindowProcW (WNDPROC lpPrevWndFunc, HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);