MAL-2026-17485

    Dashboard / Malicious Package / MAL-2026-17485

    MAL-2026-17485

    Published: 4 Oct 2026Last Modified: 4 Oct 2026

    Summary: Malicious code in css-scroll-anchor-polyfill (npm)

    Details: Source: amazon-inspector (36596ba9b9d8c0f994abe3cd87783f4f0dc880e63d55374d3555347ce349fab2) Package is published as css-scroll-anchor-polyfill but its index.js is empty and its contents impersonate internal Wix thunderbolt registry module names (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry, and others) with a shipped registry-manifest.min.json mapping them to parastorage.com URLs. The declared purpose (a CSS scroll-anchor polyfill) is unrelated to the shipped code. thunderboltRegistry.js contains a top-level IIFE that executes on require: it runs local reconnaissance via child_process.execSync (cat /etc/hosts, whoami, id, pwd, ifconfig/ip addr, hostname, uname -a) and transmits the collected output together with a beacon (node version, process.platform, pid) via fetch to a hardcoded HTTP endpoint at http://dxpoc.gt.tc/callback.php/ef9ea0e191006f3cc6670720c99c26f3. Any internal build that resolves one of the impersonated thunderbolt names to this public package and requires the corresponding submodule triggers the reconnaissance and exfiltration path.

    References: https://www.npmjs.com/package/css-scroll-anchor-polyfill/v/1.0.0

    Affected packages

    Package

    Name: css-scroll-anchor-polyfill

    Purl: pkg:npm/css-scroll-anchor-polyfill

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    1.0.0