{"id":"MAL-2026-18982","summary":"Malicious code in kazumarii-kyuuna (npm)","details":"kazumarii-kyuuna 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) 120363421930637018@newsletter, 120363422166977077@newsletter, 120363426326511354@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).","modified":"2026-11-09T23:15:31.554547152Z","published":"2026-10-27T00:00:00Z","database_specific":{"iocs":{"urls":[],"domains":[],"files":[{"paths":["lib/Socket/newsletter.js"],"digests":{"sha256":"286760765c355a9e77d089288813dd088f7ce69207b73035ba0b0bcee1ceb78a"}},{"digests":{"sha256":"afe0e5a25a34fb11b705c1e4ddff66837b0de96b465edd53712d78dc1262222f"},"paths":["lib/Socket/newsletter.js"]}],"ips":[]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/kazumarii-kyuuna"},{"type":"WEB","url":"https://www.ox.security/blog/phantomsub-malicious-npm-campaign-secretly-adds-users-to-whatsapp-spam-channels/"}],"affected":[{"package":{"name":"kazumarii-kyuuna","ecosystem":"npm","purl":"pkg:npm/kazumarii-kyuuna"},"versions":["1.0.23","1.0.24"],"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/kazumarii-kyuuna/MAL-2026-18982.json"}}],"schema_version":"1.9.2","credits":[{"name":"CyberXYZ","contact":["https://cyberxyz.io"],"type":"FINDER"}]}