We uncovered personally identifiable information (PII) stolen from a China-based hotel chain being sold on a deep web forum we were monitoring. Further analysis revealed that the stolen data was not only the PII of Chinese customers, but also included the hotel chain’s customers from Western and East Asian countries. The sample data we saw was unencrypted (in plaintext), some of which were in CSV, SQL, and TXT dumps.

https://blog.trendmicro.com/trendlabs-security-intelligence/we-uncovered-personally-identifiable-information-pii-stolen-from-a-china-based-hotel-chain-being-sold-on-a-deep-web-forum-we-were-monitoring/