The group, which has claimed credit for a prior attack on Sony’s systems, posted what appeared to be Sony BMG network maps from a New York City office and what they said was 54 megabytes of Sony developer source code.
“We are looking into these claims,” Jim Kennedy, a spokesman for Sony Pictures Entertainment, said in an email.
Last week, the group said it had broken into Sony’s computer network and accessed information on more than one million customers to show the vulnerability of the company’s systems. In that attack, the group of hackers, who have managed to keep themselves anonymous, published names, birth dates, street addresses, email addresses, phone numbers and passwords of people who had entered contests promoted by Sony.
On April 26, Sony warned that hackers had stolen personal information from 77 million user accounts of its video game online network.
On April 19, Sony pulled the plug on its PlayStation Network after discovering the breach.
On May 2, Sony revealed that hackers had stolen data of another 25 million users of its PC game systems.