Coinbase Global Inc.’s stock fell Thursday after it said it’s working with law enforcement to track down an unknown “threat actor” that paid its contractors working in support roles for the company outside the U.

Coinbase Global Inc., a major U.S. cryptocurrency exchange with more than 100 million customers, disclosed today that cybercriminals bribed offshore customer service support agents to steal customer data.

Coinbase says a criminal gang bribed a small number of overseas customer support agents and persuaded them to copy