Sony has revealed that it took down 2,500 stolen customer details after they were posted online, showing an escalation in the war between the technology firm and disgruntled hackers.
Sony said that it discovered the data posted on an "out-of-date and inactive" website. The information mostly belonged to American customers who entered a 2001 product sweepstake, revealing that Sony has been hanging onto these details for a decade.
Sony did not say which website the information was posted on, but it took the website down as soon as it found it and said it is “aggressively removing any residual links to the list”.
The company's servers were hacked last month in what is one of the largest data breaches in history. Millions of user details, which included passwords and credit card details, were stolen, forcing Sony to offer free identity theft protection to those affected.
The PlayStation Network remains offline, despite earlier promises it would be back up last week, while Sony struggles to get its other affected services, which include Qriocity and Sony Entertainment Online, back into action.
Sony has accused hacktivist group Anonymous of organising the attacks, but the group has denied it, while admiting that some of its members may have acted alone. Recent findings suggest that a breakaway group from Anonymous was the most likely culprit.
Sony said it is “taking time to strengthen the protection and coding of data” and would also build surveillance functions for additional security. It said it will resume its services in stages across different regions, providing it is certain they are secure.