Second attack involving SWIFT targeted a commercial bank, which the company declined to identify. In February, $81 million cyberheist at the Bangladesh central bank was carried out by hacking into SWIFT, the global financial messaging system that thousands of banks and companies around the world use to transfer billions of dollars every day. In both cases, insiders or hackers had successfully penetrated the targeted banks’ systems, pilfering user credentials and submitting fraudulent messages that correspond with money transfers. The malware used in the attack also has the capability to intercept and destroy incoming messages confirming the money transfers, preventing hackers to remain undetected.
Source: https://thehackernews.com/2016/05/swift-bank-hack.html