If I have it right, there were Specific parameters to get to the Iran centrifuges, attacking specific Siemans software and equipment...Although that worm is loose it will be next to impossible to meet those parameters again..People also know how to find it now and are looking for it...
So, imo, everyone has something that can shut just about anything down...They all know each other have it...So if I strike you, you will strike me...(I compare it to nukes)....
Im sure there is a lot of newly planted worms out there, I just think no one is in a hurry to start an exchange. It would be M.A.D.ness.......I'd be more worried about some accidental activation or a bad actor like North Korea or hackers, saying F it......
Anyhoot,,,I maybe be wrong but that's what I gotten out of it so far..
Stuxnet was a multi-part worm that traveled on USB sticks and spread through Microsoft Windows computers. The virus searched each infected PC for signs of Siemens Step 7 software, which industrial computers serving as PLCs use for automating and monitoring electro-mechanical equipment. After finding a PLC computer, the malware attack updated its code over the internet and began sending damage-inducing instructions to the electro-mechanical equipment the PC controlled. At the same time, the virus sent false feedback to the main controller. Anyone monitoring the equipment would have had no indication of a problem until the equipment began to self-destruct.