{"id":"MAL-2026-18984","summary":"Malicious code in koezoet-new (npm)","details":"koezoet-new 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) 120363420240545870@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:32.405890837Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"ips":[],"urls":[],"domains":[],"files":[{"paths":["lib/Socket/newsletter.js"],"digests":{"sha256":"68385075e0aa1f6730f827fbca80b853e40f2f9f9ffbcf5bdf55a3dbb02530d1"}}]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/koezoet-new"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"koezoet-new","ecosystem":"npm","purl":"pkg:npm/koezoet-new"},"versions":["1.0.0","1.0.1"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/koezoet-new/MAL-2026-18984.json","cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}]}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}