The Mercado Bitcoin exploit occurred days after a separate cyberattack stole over $6 billion from cryptocurrency exchange Binance, which the FBI attributed to North Korea's TraderTraitor group

From the articleBrazil’s Largest Crypto Exchange Mercado Bitcoin Hit by Possible $40M HackAlso in Mercado Bitcoin Says It Will Absorb $40 Million Loss From Hack, Brazil's Largest Exchange Mercado Bitcoin Halts Withdrawals After $40 Million Hack - Decrypt, Mercado bitcoin hit by $40 million hack across 10 blockchains