Heber

“But this wasn’t the end of it. Normal malware executes its code in a straightforward manner by simply calling up the code and launching it. But this was too easy for Stuxnet. Instead, Stuxnet was built like a Rube Goldberg machine so that rather than calling and executing its code directly, it planted the code inside another block of code that was already running in a process on the machine, then took the code that was running in that process and slipped it inside a block of code running in another process to further obscure it.”
― Kim Zetter, Countdown to Zero Day: Stuxnet and the Launch of the World's First Digital Weapon