If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
@billabilloyy/baileys is a fork of the Baileys WhatsApp Web library that silently subscribes the installer's own WhatsApp account to WhatsApp Channels chosen by the publisher. When the socket connects, code in src/Socket/newsletter.js, src/WAUSync/Protocols/USyncNewsletterProtocol.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363395678317603@newsletter, 120363400362472743@newsletter, 120363408893555851@newsletter, 120363426470081124@newsletter, 120363427718144294@newsletter and the channel invite code(s) 0029VbCX3x9Ae5VxVnDa172S, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).