Binance on how they lost 6.3 BILLION dollars:
The 0-day malware was not detected by the endpoint security protection tools at the time.
No. There is no such thing as "0-day malware". You had two employees who got convinced to download and execute malware, which happened to be undetected by whatever magic protection you believed in.
"0-day" is not a term you sprinkle into your words to convey "It's not our fault"