MAL-2026-12523 Malicious code in cards-forms-cards-core-clone (npm)
Malicious package
Published
MAL-2026-12523 is a malicious package: cards-forms-cards-core-clone (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-12523/ (Markdown: https://insights.sbomify.com/MAL-2026-12523/index.md)
- Package
- cards-forms-cards-core-clone
- Registry
- npm
What is MAL-2026-12523?
MAL-2026-12523 is a malicious package in cards-forms-cards-core-clone, published on 5 Aug 2026.
Official description
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.
What should I do about MAL-2026-12523?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.