Revealed: 8 million victims in the world's biggest cyber heist

A Sunday Herald investigation has discovered that late on Thursday night, a previously unknown Indian hacker successfully breached the IT defences of the Best Western Hotel group's online booking system and sold details of how to access it through an underground network operated by the Russian mafia.

The attack scooped up the personal details of every single customer that has booked into one of Best Western's 1312 continental hotels since 2007.

Amounting to a complete identity-theft kit, the stolen data includes a range of private information including home addresses, telephone numbers, credit card details and place of employment.