I tried corroborating the claim that the hackers were Chinese. Couldn't find a reliable source. Anyone have anything? For future reference, Zero Hedge is a low-quality source.
http://www.scmp.com/news/asia/south-asia/article/1922556/ban...
VICE: "The Fed had the responsibility to keep the money safe," Shamim Ahamad, press minister at the Bangladesh Embassy in Washington, told VICE News. "We are suspecting that Chinese hackers have done it."
https://news.vice.com/article/bangladeshs-central-bank-accus...
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Security experts said that to pull off the attack, cyber criminals had to first gather information about Bangladesh Bank's procedures for ordering transfers, so that the fraudulent requests would not raise red flags.
In addition to stealing credentials for processing transfers, the hackers likely spied on Bangladesh Bank staff to get a deep understanding of the central bank's operations, according to experts in banking fraud.
Kayvan Alikhani, a senior director with security firm RSA, said that in addition to user names and passwords for accessing SWIFT, the hackers likely needed to obtain cryptographic keys that authenticated the senders.
"""
So maybe insiders were involved?
http://www.reuters.com/article/us-usa-fed-bangladesh-idUSKCN...