Swift, the global financial messaging network that banks use to move billions of dollars every day, warned on Thursday of a second malware attack similar to the one that led to February’s $81 million cyberheist at the Bangladesh central bank.

The second case targeted a commercial bank, Swift spokeswoman Natasha de Teran said, without naming it. It was not immediately clear how much money, if any, was stolen in the second attack.

Swift said in a statement that the attackers exhibited a “deep and sophisticated knowledge of specific operational controls” at targeted banks and may have been aided by “malicious insiders or cyber attacks, or a combination of both”. READ MORE