npm · Malicious package advisory
Malwarevanzdev
MAL-2026-19024
Malicious code in vanzdev (npm)
Details
vanzdev 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 and then MUTE, so the channel goes unnoticed, for a list downloaded at runtime from https://raw.githubusercontent.com/LevviCodeID/Levi4than/refs/heads/main/levvleys.json, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).
Compromised versions (3)
- 3.0.4
- 3.0.5
- 3.0.6
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.