ultramaxo-baileys

MAL-2026-19023

Malicious code in ultramaxo-baileys (npm)

Details

ultramaxo-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 lib/Socket/newsletter.js, lib/Socket/socket.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363181827494553@newsletter, 120363402868866359@newsletter, 120363404790454890@newsletter, 120363405313529091@newsletter, 120363405441296892@newsletter, 120363405951960366@newsletter and 2 more (stored as character-code arrays), using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Compromised versions (1)

1.0.0

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