MAL-2026-18447: Malicious code in zystcdemo (npm)

zystcdemo presents itself as a simple date formatting utility and runs its postinstall payload on npm install with node postinstall.js. The payload collects the whoami result, hostname, platform, and current time, then sends them in a POST request to https://srctest.zystcc.cn/collect; npm account zyst published it on 2026-10-29 (UTC).