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Malicious package

cards-forms-clone-debit-clonenpm

Advisory published Updated

cards-forms-clone-debit-clone is a confirmed malicious npm package (MAL-2026-12526) that opens a backdoor for remote access (malicious version 35.8.6). Do not install it — remove it immediately and rotate any exposed credentials.

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

MAL-2026-12526
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall cards-forms-clone-debit-clone

What this malware does

On require(), index.js loads bootstrap.js which reconstructs endpoint hostnames from split string fragments (assembling *.workers.dev hosts such as oob-worker.cf100-416.workers.dev, cf103-070, cf102-baf, with a DNS-TXT chunked fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), downloads a platform-specific binary, writes it under a decoy filename ('dotnet_diag<hex>.exe' on Windows, '.cache_<hex>' on POSIX) into /tmp or %TEMP%, chmods it 0755, and detach-spawns it via '/bin/sh -c <path> &' or 'cmd.exe /c start /b'. No hash or signature verification is performed and the fetch URLs are unpinned. Telemetry-style cover strings ('.analytics_state', DISABLE_TELEMETRY / DO_NOT_TRACK env-var gating) and host-string reassembly conceal the C2 destinations and the nature of the dropped executable.

Malicious versions

1 flagged
35.8.6

Indicators of compromise (SHA-256)

af0f7b9b02ef9fef4376ec3f311e60acabe0881cd5ef1ffa503571bdce2158a4

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for cards-forms-clone-debit-clone (version 35.8.6).

  2. If you installed it — respond

    cards-forms-clone-debit-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-clone-debit-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-clone-debit-clone on npm has been identified as a malicious package (version 35.8.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015255

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks cards-forms-clone-debit-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

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cards-forms-clone-debit-clone (npm) malicious package — MAL-2026-12526 | O3 Security