Four Hawaii hotels that are part of the Hyatt chain were affected by malicious software aimed at customers’ financial and personal information.

Hyatt said Thursday it found malicious software in about 250 of its hotels that may have exposed customers’ credit- and debit-card numbers and other information to hackers.

It’s the first time the hotel operator has listed the hotels affected since it announced it found malware at its hotels in December.

The Hyatt Regency Waikiki Beach Resort and Spa, Grand Hyatt Kauai, Hyatt Regency Maui Resort and Spa and Andaz Maui were among the hotels listed.

It is not known how many customers were affected, a Hyatt spokeswoman said.

The malware affected the chain’s payment systems at its restaurants, spas, front desks and other areas from July to December, a Hyatt spokeswoman said.

Cardholder names, card numbers and expiration dates may have been exposed, the company said.

Several other hotel chains reported being hacked last year, including Starwood, Trump Hotel Collection and Mandarin Oriental.

Hyatt said the malware was found at many of its brands, including the Park Hyatt, Hyatt Regency and Andaz. About 100 of the hotels affected were in the U.S. The rest were abroad in cities including London, Paris and Shanghai.

The Chicago-based company has about 630 properties.

For more information, call 877-218-3036 or visit hyatt.com/protectingourcustomers.