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Malicious package

css-relative-color-utilnpm

Advisory published Updated

css-relative-color-util is a confirmed malicious npm package (MAL-2026-17484) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in css-relative-color-util (npm)

MAL-2026-17484
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall css-relative-color-util

What this malware does

The package name advertises a CSS utility, but thunderboltRegistry.js runs an IIFE on module load that uses child_process.execSync to execute whoami, uname -a, cat /etc/hosts, and ifconfig/ip addr, then exfiltrates the output together with os.hostname and the Node version to a hardcoded webhook at https://dxpoc.gt.tc/callback.php/ via fetch and to an *.oast.live DNS collector via dns.resolve. The loader deletes any require.cache entry containing 'thunderboltRegistry' so the IIFE re-fires on subsequent requires, and falls back to node:child_process and new module.constructor().require('child_process') to obtain the exec primitive. The package also exports stubs named thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry and similar, matching internal Wix thunderbolt module names, with a registry-manifest.min.json pointing at static.parastorage.com unpkg paths — a dependency-confusion shape targeting an internal namespace. The declared CSS-utility purpose is unrelated to any of this behavior.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

ee0efef48c7d56201a037b237f11ec712853f86e74f6a00ef8011732b31363f1

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for css-relative-color-util (version 1.0.0).

  2. If you installed it — respond

    css-relative-color-util is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If css-relative-color-util was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. css-relative-color-util on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020887

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks css-relative-color-util-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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css-relative-color-util (npm) malicious package — MAL-2026-17484 | O3 Security