I saw this featured on freeview Aljazeera last night. It's no joke and not an exaggeration. The virus infects Siemens hardware which is used in the computer system of the Iranian nuclear reactor programme. Unfortunately, it has also infected Siemens hardware systems in India and Indonesia. The experts warn that piggyback viruses are also a concern, which can be downloaded even if you google the virus name, which is S**xn**. Here's the news link A new frontier in cyber war?