Germany-based motel one Group, one of Europe's best-known budget hotel chains, has become the target of a hacker attack.
In a press release on its website, motel one group wrote that previously unknown perpetrators had hacked into the hotel operator's internal systems, while the names and travel information of millions of customers appeared online.
According to research by Süddeutsche Zeitung (SZ), the almost six terabyte data set contains almost complete guest lists for the last few years since 2016. Private billing addresses, customers' dates of birth, internal business figures and some cell phone numbers of employees can also be viewed online, according to the report.
The hacker group ALPHV claimed responsibility for the hacker attack on the Motel One Group hotel chain, confirming that the published data included guests' credit card details and that those affected were informed, Motel One said in a press release:
''If further investigation reveals further indications of specific risks for those affected, we will of course contact those affected directly. Despite the attack, business operations and therefore future bookings are not at risk for now. Our security experts are continuing to investigate the incident and we guarantee data security. Criminal charges have also been filed against those responsible.''
The ALPHV hacker group, also known as the black cat, which claimed responsibility for the attack, which was probably intended to extort money, has in the past published sensitive data on cancer patients.