Hackers once had to manually test security defenses, identify vulnerabilities and work out how to exploit them. Now, artificial intelligence (AI) can do much of that work, requiring little human input. That possibility is at the center of Korea's latest security crisis in the financial sector, as investigators have found traces of an AI-powered autonomous penetration-testing tool in a series of recent cyberattacks on the country's major banks. Since last week, Shinhan Bank, KB Kookmin Bank, Hana Bank, Yegaram Savings Bank and BNK Busan Bank have all reported data breaches, while Woori Bank and NH NongHyup Bank have detected signs of hacking attempts, though no data leaks were confirmed. Shinhan Bank reported that about 25,000 customers were affected, with personal information including names, phone numbers, annual income and loan limits exposed. KB Kookmin reported 119 affected customers, while Hana Bank said personal information belonging to 89 customers was exposed. The hacking spree has drawn particular concern after investigators reportedly found traces of an AI-powered tool known as