Crowdstrike reported that a suspected Chinese-speaking attacker used ARTEX, an AI-powered penetration testing tool, to breach multiple South Korean banks in late September and early October 2026, stealing over 25,000 records from Shinhan Bank alone. The incident demonstrates how AI tools can enable a single attacker to conduct massive breaches quickly, prompting South Korea's financial regulator to hold an emergency meeting and President Lee Jae Myung to call for a thorough investigation.