{"id":"MAL-2026-18447","summary":"Malicious code in zystcdemo (npm)","details":"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).","modified":"2026-11-02T05:15:06.170922124Z","published":"2026-10-29T07:22:48Z","database_specific":{"iocs":{"files":[{"digests":{"sha256":"b6c29c2cef0bd04855139d27a212f9b22e65d5e1f3b6eecdb80817d23c2c4715"},"note":"postinstall script: node postinstall.js","paths":["package.json"],"source":"PACKAGE_ARCHIVE"},{"paths":["postinstall.js"],"source":"PACKAGE_ARCHIVE","digests":{"sha256":"547a4a4aabd7457ac739bd65076e85fa267d75ae5fced8572d4f1621683183b2"},"note":"Executed by the postinstall script of zystcdemo@1.0.0."}],"ips":["49.233.127.33"],"urls":["https://srctest.zystcc.cn/collect"],"domains":["srctest.zystcc.cn"]}},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/zystcdemo"}],"affected":[{"package":{"name":"zystcdemo","ecosystem":"npm","purl":"pkg:npm/zystcdemo"},"versions":["1.0.0"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/zystcdemo/MAL-2026-18447.json","cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}]}}],"schema_version":"1.9.2","credits":[{"name":"InvisiRisk, Inc.","contact":["https://www.invisirisk.com","mailto:research@invisirisk.com"],"type":"FINDER"}]}