"We have investigated the claims that our network was breached and have found no evidence that there was any intrusion into our network," a Sony rep wrote to Joystiq. "Unfortunately, Internet fraud including phishing and password matching are realities that consumers and online networks face on a regular basis. We take these reports very seriously and will continue to monitor our network closely."
According to Cnet, the group leaked these logins in a public Pastebin document. However, both the group's Twitter account linking to the document and the document itself have since been taken down. Cnet reports that the group also revealed 1,473 Windows Live logins, and 2,000 2K Games logins. We've reached out to Microsoft and 2K to confirm network intrusion and will update if we hear back.