At first, technicians at multinational energy giant Schneider Electric thought they were looking at the everyday software used to manage equipment inside nuclear and petroleum plants around the world. They had no idea that the code carried the most dangerous industrial malware on the planet.

More than four months have passed since a novel, highly sophisticated piece of malware forced an important oil and gas facility in the Middle East to suddenly shut down, but cybersecurity analysts still don’t know who wrote the code.

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