These are slides from a presentation call WinCC Under X-Rays.
You can download it from the following link: https://packetstormsecurity.com/files/download/119730/pt-s42013-scadaunderxrays-130117081345-phpapp01.pdf
Source: https://packetstormsecurity.com/files/119730/WinCC-Under-X-Rays.html