Abusing callback to run shellcode.
Eksekusi shellcode dengan GrayString.
BOOL GrayStringA (HDC hDC, HBRUSH hBrush, GRAYSTRINGPROC lpOutputFunc, LPARAM lpData, int nCount, int X, int Y, int nWidth, int nHeight);
BOOL GrayStringW (HDC hDC, HBRUSH hBrush, GRAYSTRINGPROC lpOutputFunc, LPARAM lpData, int nCount, int X, int Y, int nWidth, int nHeight);