I read a fantastic article on Stuxnet. I can't find it now, but this should cover it, if you don't know the details https://www.csoonline.com/article/3218104/w

I read a fantastic article on Stuxnet. I can't find it now, but this should cover it, if you don't know the details https://www.csoonline.com/article/3218104/what-is-stuxnet-who-created-it-and-how-does-it-work.html https://www.csoonline.com/article/3218104/what-is-stuxnet-wh... To pull of what they did, they knew multiple zero-day vulernabilities in Windows. To any reasonable security-minded person, knowing that many vulnerabilities and having the ability to capitalize on them is likely only achievable a few different ways, one of those ways being having an arrangement with the company whose vulnerabilities you were exploiting.