If you’re a fan of rapper Jay-Z, and are comfortable installing apps onto your Android from non-official sources, then you should probably be on your guard.

After the social security numbers, addresses and financial details of some of the USA’s top celebrities were posted online, top credit bureaus have come forward and acknowledged that fraudulent and unauthorized access to their records has taken place.

Beyoncé, Michelle Obama, Paris Hilton and more public figures have had their personal information exposed on the internet.

But who is behind it?