Stuxnet was an exceptionally sophisticated piece of code written by people who knew Windows, Siemen PLCs, and other details about the enrichment facility in Natanz (Iran) It was designed to remain invisible so it could continually sabotage the facility for years without being detected. You cant read Countdown without becoming more paranoid about a cyber-attack on critical infrastructure. Countdown takes you into the deep dark world of the zero-day vulnerabilities market and explores the legal and moral issues around this practice.”]
Source: https://www.csoonline.com/article/2883638/book-report-countdown-to-zero-day.html