Once alerted, officials put a stop to the remaining transfers, which amounted to nearly $850 million. The $81 million theft is still one of the largest ever, but if all the transfers had gone through, it would have been one of the biggest heists on record. Last year, Russian hackers reportedly got away with up to $1 billion from 100 banks using malware.

Meanwhile, Bangladeshi officials are trying to lock down their systems and figure out how the attack happened, but say there's little hope the hackers and money will be recovered. As with many large-scale attacks, experts told Reuters that the thieves likely targeted and spied on employees to gain access to servers. While the bank blames the US Federal Reserve Bank for not stopping the transfers, Fed officials say that its systems were not breached and that it has been cooperating in the investigation. Luckily, hackers are just as bad at spelling in large fraud attempts as they are in basic spear-phishing attacks.