Stuxnet is a Microsoft Windows computer worm discovered in July 2010. It is the first discovered malware that spies on and subverts industrial systems. The worm is designed to programmatically alter Programmable Logic Controllers (PLCs) used in those facilities. The PLCs automate industrial type tasks such as regulating flow rate to maintain pressure and temperature controls. Source Code Released Online – Download Now to see the latest version of the worm code for the first time in the wild. The code is available to download at www.cybersecurity.com/stuxnet.
Source: https://thehackernews.com/2011/07/stuxnet-source-code-released-online.html