The npm package @revizahoshii/hoshino version 1.1.0 is a malicious fork of the Baileys WhatsApp Web library. It injects code that silently subscribes the victim's authenticated WhatsApp account to attacker-controlled channels without user consent. The target channels are obfuscated or dynamically fetched, allowing attackers to modify targets after installation. The malicious code abuses the authenticated session but does not steal credentials, maintain persistence, or execute arbitrary code.