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Malicious package

cards-forms-cards-core-clonenpm

Advisory published Updated

cards-forms-cards-core-clone is a confirmed malicious npm package (MAL-2026-12523) that opens a backdoor for remote access (malicious version 35.3.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in cards-forms-cards-core-clone (npm)

MAL-2026-12523
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall cards-forms-cards-core-clone

What this malware does

On require(), index.js loads runtime.js which detects OS and CPU architecture, reconstructs C2 hostnames from split string fragments (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), and downloads a platform-specific executable over HTTPS. If those origins are unreachable, it falls back to a DNS-TXT-based delivery channel that reassembles a base64-encoded payload from numbered subdomains under *.dl.wel1.ru. The fetched binary is written to /tmp or %TEMP% under a disguised name (e.g. dotnet_diag<rand>.exe or.cache_<rand>), chmodded 0755, and spawned detached via /bin/sh -c or cmd /c start. A TTL cache file (/tmp/.analytics_state) suppresses re-detonation on subsequent installs. The package name resembles a legitimate forms/cards library but ships no matching functionality; its only import-time effect is dropper execution.

Malicious versions

1 flagged
35.3.2

Indicators of compromise (SHA-256)

9d987094f38a49c0bb9ae5329e3ff47d97489ee5af348ebc7e056e752cffc1fb

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for cards-forms-cards-core-clone (version 35.3.2).

  2. If you installed it — respond

    cards-forms-cards-core-clone 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 cards-forms-cards-core-clone 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. cards-forms-cards-core-clone on npm has been identified as a malicious package (version 35.3.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015245

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks cards-forms-cards-core-clone-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

All malware advisories How O3 detects malware Vulnerability database
cards-forms-cards-core-clone (npm) malicious package — MAL-2026-12523 | O3 Security