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Malicious package

sme-rko-finance-front-operations-special-paymentsnpm

Advisory published Updated

sme-rko-finance-front-operations-special-payments is a confirmed malicious npm package (MAL-2026-13648) that opens a backdoor for remote access (malicious version 35.8.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in sme-rko-finance-front-operations-special-payments (npm)

MAL-2026-13648
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall sme-rko-finance-front-operations-special-payments

What this malware does

On require() of the package, index.js loads support.js which downloads a platform-specific binary from string-concatenated cloudflare workers.dev subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS TXT chunked-transfer fallback to *.dl.wel1.ru. The payload is written to /tmp with a hidden name (.cache<hex>) or to %TEMP% as dotnet_diag_<hex>.exe on Windows, chmodded 0755, and spawned detached via /bin/sh -c or cmd. The declared main module lib/telemetry.js contains a duplicate dropper path under an 'analytics SDK' cover story, base64-decoding transport chunks before executing the resulting binary the same way. C2 host names and dangerous API names (child_process, chmodSync) are constructed at runtime via array-join and string concatenation to defeat static analysis. Both dropper paths fire at library load time on any require of the package.

Malicious versions

1 flagged
35.8.1

Indicators of compromise (SHA-256)

3a7bfbc55631ce8b054b20444bf1e335244c998fcf00d1709f951b1afa4cb242

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for sme-rko-finance-front-operations-special-payments (version 35.8.1).

  2. If you installed it — respond

    sme-rko-finance-front-operations-special-payments 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 sme-rko-finance-front-operations-special-payments 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. sme-rko-finance-front-operations-special-payments on npm has been identified as a malicious package (version 35.8.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-017151

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks sme-rko-finance-front-operations-special-payments-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
sme-rko-finance-front-operations-special-payments (npm) malicious package — MAL-2026-13648 | O3 Security