U.S. oil giant Chevron found virus in its systems after it was first reported in blog post in July 2010. Stuxnet, a sophisticated computer virus created by the United States and Israel, also infected Chevron’s network in 2010. Chevron’s experience appears to be the result of the malware’s unintentional release into cyberspace, much like an experimental virus escaping from a medical lab, according to the Wall Street Journal. The government has never officially acknowledged the StuxNet program. U.N. officials have blamed Iran for creating the Shamoon virus, which was responsible for cyber attack that infected more than 30,000 computers at Saudi Arabian oil company Saudi Aramco and Qatar’s natural gas firm Rasgas in mid-August.
Source: https://thehackernews.com/2012/11/stuxnet-virus-also-infected-chevrons-it.html