Attackers are abusing legitimate features of ChatGPT, Claude, and Microsoft 365 to deliver malware and steal credentials without triggering standard security controls. Because the malicious content is hosted on trusted domains (chatgpt.com, claude.ai) or sent through authenticated internal mail infrastructure, blocklists and reputation-based defenses do not apply. Any organization whose employees use these platforms or rely on Microsoft 365 mail is exposed, and credential theft or malware infection may occur without any security alert firing.