The hackers didn't exploit a vulnerability in Swift - they didn't need to have to - so as far as Swift's software was concerned the hackers looked like genuine bank personnel. https://white-third.com/2024/12/21/%ed%8c%8c%ec%9b%8c%eb%b3%bc-%ea%b8%b0%ec%88%a0-%eb%b6%84%ec%84%9d-%ec%8a%b9%eb%a5%a0%ec%9d%84-%eb%86%92%ec%9d%b4%eb%8a%94-%ec%a0%84%eb%9e%b5%ea%b3%bc-%eb%b0%a9%eb%b2%95/