{"id":"MAL-2026-19023","summary":"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).","modified":"2026-11-09T23:15:34.545247067Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"files":[{"digests":{"sha256":"fad2d892611c62196223eefc5bc54030c0fe7d251276c035277b0a126971a810"},"paths":["lib/Socket/newsletter.js"]},{"digests":{"sha256":"e334fa63b4bb6f4bf98d57859e49dd948022584a2acbdf4bddc68a675cfe1965"},"paths":["lib/Socket/socket.js"]}],"ips":[],"urls":[],"domains":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/ultramaxo-baileys"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"ultramaxo-baileys","ecosystem":"npm","purl":"pkg:npm/ultramaxo-baileys"},"versions":["1.0.0"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/ultramaxo-baileys/MAL-2026-19023.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}