An unpatched Windows zero-day vulnerability has been exploited by 11 nation-state attackers and financially motivated groups.The vulnerability allows attackers to craft malicious shortcut (.lnk) files, enabling the execution of hidden commands when opened by the user.The bug has been in use since 2017, with 70% of the attacks attributed to nation-state actors, primarily from North Korea.Microsoft considers the vulnerability a UI issue rather than a critical security issue, but may address it in a future feature release.