MAL-2026-18447

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/zystcdemo/MAL-2026-18447.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18447
Published
2026-10-29T07:22:48Z
Modified
2026-11-02T05:15:06Z
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).

Database specific 
{
    "iocs":  {
        "domains":  [
            "srctest.zystcc.cn"
        ],
        "files":  [
            {
                "digests":  {
                    "sha256":  "b6c29c2cef0bd04855139d27a212f9b22e65d5e1f3b6eecdb80817d23c2c4715"
                },
                "note":  "postinstall script: node postinstall.js",
                "paths":  [
                    "package.json"
                ],
                "source":  "PACKAGE_ARCHIVE"
            },
            {
                "digests":  {
                    "sha256":  "547a4a4aabd7457ac739bd65076e85fa267d75ae5fced8572d4f1621683183b2"
                },
                "note":  "Executed by the postinstall script of zystcdemo@1.0.0.",
                "paths":  [
                    "postinstall.js"
                ],
                "source":  "PACKAGE_ARCHIVE"
            }
        ],
        "ips":  [
            "49.233.127.33"
        ],
        "urls":  [
            "https://srctest.zystcc.cn/collect"
        ]
    }
}
References
Credits

Affected packages

npm / zystcdemo

Package

Name
zystcdemo
View open source insights on deps.dev
Purl
pkg:npm/zystcdemo

Affected ranges

Affected versions

1.*
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/zystcdemo/MAL-2026-18447.json"