yantobail

MAL-2026-19040

Malicious code in yantobail (npm)

Details

yantobail 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 lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363421346448687@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Compromised versions (1)

1.0.11

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.