Gamers unwittingly downloaded the Nimda virus from a popular game site this week, the website's chief executive has confessed.
Visitors to the GameSpy site who downloaded the company's file exchange software GameSpy Arcade 1.09 during two hours on Tuesday and five hours Wednesday night could have downloaded the virus, said GameSpy chief executive Mark Surfas.
Servers became infected during a routine clean-up and around 3,100 files are thought to be affected, Surfas said.
GameSpy informed everyone who had downloaded an infected file, and directed them to free antivirus software.
The company confessed that it had "let its guard down", but said this was the only time a lapse in security had happened.
"This registers with us as a serious, serious error," Surfas said. "We're pretty upset about it. This is not cool."
The Nimda virus emerged on the world stage last September, costing an estimated $500m to clean up.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago