The @teamolduser/baileys npm package contains malicious code that silently subscribes the victim's WhatsApp account to attacker-controlled channels without user consent. This is done by injecting a covert subscription action into the WhatsApp socket layer, which issues an authenticated FOLLOW query using the installer's own WhatsApp session. The target channels are obfuscated or dynamically fetched, allowing attackers to change targets post-installation. The malicious code does not steal credentials, establish persistence, or execute arbitrary code.