Internet crooks target check images

Check counterfeiting is a crime that savvy Internet criminals usually pass up. After all, it’s far easier for them to make money by stealing credit card numbers and online banking passwords.

The scam was discovered by SecureWorks Inc., an Atlanta computer security company. It’s working with the FBI and says the hackers have not been caught.

Retailers and other businesses use the sites to store records of all the checks they write. Check-cashing operations use them to sock away images of checks they receive. And some banks pay them to store images of customers’ checks, so the customers can see them when they log in to their online banking accounts.

The criminals downloaded all the images they could find, grabbing bank routing numbers, names and addresses, and signatures of account holders. They used the information to create their own checks with easy-to-acquire software and printers.

Because the account information is real and the victims don’t know their accounts have been compromised, the odds of the checks going through are high.

SecureWorks notified the three sites and said they have closed their security holes, but warned that the scam is ongoing and is targeting other, similar sites.

“It’s not the standard kind of criminal operation,’’ said Joe Stewart, director of malware research for SecureWorks’ Counter Threat Unit.

“Check counterfeiting is kind of old-school, but these guys have figured out how to make it highly automated,’’ he said. “They can get all this data and use that to write counterfeit checks all day long.’’

The research was being released in conjunction with the Black Hat computer security conference in Las Vegas, which runs today and tomorrow and draws security professionals from around the world to hear about the latest vulnerabilities and attacks and ways to thwart criminals.

Notable presentations this year are to include a demonstration of how to break into widely used ATMs. Researchers are also expected to discuss vulnerabilities in smartphones and in the technology used to secure online transactions.