The spencer-baileys npm package version 1.0.4 is a malicious fork of the Baileys WhatsApp Web library that silently subscribes the user's WhatsApp account to attacker-controlled channels without user consent. This is done by injecting code that issues an authenticated FOLLOW query using the victim's own WhatsApp session. The target channel identifiers are obfuscated or fetched remotely to evade detection. The malicious code does not steal credentials, maintain persistence, or execute arbitrary code.