Researchers spot the $1.4 billion stolen from Bybit moving through cryptocurrency wallets that were used in earlier heists attributed to North Korea's Lazarus hacking group.

Cryptocurrency exchange Bybit said last week hackers had stolen digital tokens worth around $1.5 billion, in what researchers called the biggest crypto heist of all time. Bybit CEO Ben Zhou said the crypto was taken from a "cold wallet" - a digital wallet usually stored offline and so supposedly more secure - that was used for ether tokens.

Less than 72 hours later, Zhou said Bybit had restored the exchange’s balance and kept customer withdrawals open, although he did not account for the stolen crypto. The scale of the Bybit theft surpasses the previous record of a $615 million heist of Ethereum and U.