A hacker group recently stated that it has posted more than 2,000 PlayStation Network logins. On the other hand, after an internal investigation, Sony claimed that there has been no such infringement to the PSN systems.

The group, which calls itself DerpTrolling, released a document on Pastebin asserting that it encompasses usernames and passwords of 2,131 PSN users, 1,473 Windows Live users, and 2,000 2K Games users.

The group stated that the document was revealed as a warning to the companies. Sony examined the statements and published a statement: “We have investigated the claims that our network was breached and have found no evidence that there was any intrusion into our network”.

Nonetheless, Sony also stated that those passwords might have been acquired through phishing attacks and Internet fraud.

“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.” a Sony rep told the press.

The group stated that it owns 1.7 million EA Origin accounts, 800,000 2K accounts, and also half a million credit cards. So far, none of these claims was proved.

Sony suffered a massive data breach in 2011, where millions of PSN accounts were breached. Sony has since then reinforced their security systems. Still, earlier this year, the company lost an important class action lawsuit over the incident.

To add to the injury, back in August, PSN was attacked by hackers who also targeted a plane carrying a Sony executive. The plane was threatened and it had to be diverted to another airport.