US firm demonstrates AI-driven WeChat hijack, urges US-China cyber cooperation

US security firm Calif claims its AI system found a critical flaw in Tencent's WeChat, enabling account hijacking via unanswered voice calls, and developed a proof-of-concept exploit (WeWorm) in about a week. The demonstration highlights the growing use of AI in offensive cyber operations and has prompted renewed calls for US-China cyber cooperation. The claim is based on the firm's own disclosure; independent verification is pending.