Chevron, which has headquarters in California, confirmed that its computer systems were infected with Stuxnet, a virus that struck Iranian nuclear facilities at Natanz. Chevron spokesman Morgan Crinklaw was quoted by The Wall Street Journal as saying the company was protected from major damage to its network.
"We make every effort to protect our data systems from those types of threats," he said.
Alan Paller, founder or cybersecurity company SANS, was quoted by the Journal as saying that more broad-based cyberattacks suggests almost any industrial component targeted by viruses like Stuxnet are vulnerable.
"Whatever restraint might have been holding damaging attacks back are gone," he said.