Chevron became the first U.S. company to admit that it, too, was infected by Stuxnet. The pioneering computer virus was designed to attack a single Iranian uranium enrichment facility. Chevron found that some of its systems had been infected by the virus in July 2010. The virus reportedly did disable a number of centrifuges at Natanz, but it also spread. The only defense — admittedly imperfect — is radically improved technical skills, an expert says, “The downside of what they did is going to be far worse than what they actually accomplished””]
Source: https://www.darkreading.com/attacks-breaches/cyber-weapon-friendly-fire-chevron-stuxnet-fallout