Part 4/9:
The hackers took advantage of this top-up process, utilizing a multi-signature wallet service that required approval from multiple parties, with the CEO being the final signatory. Unfortunately, the CEO unwittingly clicked a fraudulent link that appeared legitimate. While intending to carry out a typical transaction, he was unknowingly about to transfer funds to North Korean hackers. Despite having a Ledger device to verify the transaction—an essential safety feature that displays the recipient address—the CEO bypassed crucial verification steps, ultimately authorizing the transfer of $1.5 billion in cryptocurrency.