Attackers deployed malware on an OTC transaction manager's computer at Cashaa. The malware remained dormant until the employee logged into the system, then initiated 8 separate Bitcoin transfers totaling 335.91 BTC to attacker-controlled wallets across two days.

Cashaa, a UK-based cryptocurrency exchange, said hackers stole 336 Bitcoins from a wallet on the exchange. The company has now stopped all transactions related to cryptocurrency.