Hyatt recently reported their credit card payment processing system was infected with credit-card-stealing malware.  While they quickly halted the malware attacks shortly after discovery, customers are now being warned to carefully check credit card statements and quickly report all unauthorized transactions 

http://www.reuters.com/article/us-hyatt-hotels-hacking-idUKKBN0U704320151225

http://www.hyatt.com/protectingourcustomers

Hyatt Hotels Corp said on Wednesday that its payment processing system was infected with credit-card-stealing malware in an attack discovered three weeks ago, the latest in a series of breaches at hospitality firms.  Company spokeswoman Stephanie Sheppard said in an email late on Wednesday that the attack was discovered on Nov. 30.

She did not say if the attackers succeeded in stealing payment card numbers, how long its network was infected or how many of the chain’s 627 hotels were affected.  Hilton Worldwide Holdings Inc and Starwood Hotels & Resorts Worldwide Inc last month disclosed attacks on payment processing systems.. Donald Trump’s luxury hotel chain, Trump Hotel Collection, also confirmed the possibility of a data security incident.

FireEye Inc said that Hyatt had hired it to help the company investigate the attack. FireEye’s Mandiant unit is one of the biggest providers of response services to companies that are victims of cyber attacks.  Representatives at a Hyatt call center set up to handle inquiries about the breach said the malware was programmed to collect payment cardholder names, card numbers, expiration dates and internal verification codes. “We have taken steps to strengthen the security of our systems,” Sheppard said in the email. “Customers can feel confident using payment cards at Hyatt hotels worldwide.”