The Stuxnet Worm attempted to infiltrate five industrial complexes in Iran over a span of ten months according to a report in the New York Times based on a report published by Symantec. The worm was designed to not only attack control systems built by Siemens Corporation, but also to obscure itself by sending false information to control computers monitoring the system. The Times report does not release the names of the companies linked to the suspected domains because of privacy restrictions, the Times report claims they are all linked to industrial processing within Iran.
Source: https://threatpost.com/ny-times-stuxnet-traced-five-iranian-internet-domains-021411/74937/