In March, Mandarin Oriental confirmed a malware attack on its credit card systems in a number of its hotels. After launching an investigation, the company now knows more about the incident and is notifying affected guests. In a press release, the company said it appears the hacker used malware to acquire the names and credit card numbers of guests who used a credit card for dining, beverage, spa, guest rooms, or other products and services at Mandarin Oriental properties in Boston, Geneva, Hong Kong, Hyde Park, Las Vegas, Miami, New York, San Francisco, Washington, D.C., and Hong Kong. The company shared the specific timeframes each property was affected. The company stated that it did not find any evidence of acquisition or misuse of credit card pin numbers or security codes, or any other personal guest data.