Hyatt Hotels chain across the was infected by a malware attack back in January 2016.
The attackers designed the malware to exfiltrated payment card information including cardholder names, card numbers, expiration dates, and internal verification code affected payment processing systems.
The hotel chain offered one year’s free protection to those affected by the breach,
Source: https://blog.itgovernanceusa.com/blog/hyatt-names-hotels-affected-by-payment-information-malware
TPRM report: https://scoringcyber.rankiteo.com/company/hyatt
"id": "hya1348522",
"linkid": "hyatt",
"type": "Ransomware",
"date": "01/2016",
"severity": "90",
"impact": "5",
"explanation": "Attack threatening the organization's existence"