What is the biggest bank cyber heist ever?

Brazil suffered 1 of the biggest single bank-payment cyber heists in July 2025. Hackers diverted more than $100 million from 1 financial institution, with reports estimating roughly $180 million across affected institutions. Their way in? C&M Software, a tech supplier connecting financial institutions to Brazil's PIX payment system. Some stolen funds were converted into crypto. In 2016, hackers stole $81 million from Bangladesh Bank. The Carbanak gang was linked to estimated losses of up to $1 billion across financial institutions over several years. No guns. No masks. Just stolen access. My forecast: more than $1 billion stolen from banks worldwide by 2028, counted from January 2026.