# MAL-2026-13660: Malicious code in sme-rko-finance-front-payments-domain (npm)


- **Type:** Malicious package
- **Package:** `sme-rko-finance-front-payments-domain` (npm)
- **Published:** 8 Aug 2026

## What is MAL-2026-13660?

MAL-2026-13660 is a malicious package in sme-rko-finance-front-payments-domain, published on 8 Aug 2026. 

### Official description

On require() of the package, index.js loads./_polyfill.js which assembles a set of C2 hostnames from split string fragments via.join('') — resolving to 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 base64 fallback via sdk.dl.wel1.ru. _polyfill.js downloads an OS-specific binary via https.get, writes it under /tmp or %TEMP% with a disguised name (e.g..cache_<hex> or dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via spawn('/bin/sh', ['-c', path+' &']) or spawn('cmd',...). No pinning, no hash/signature verification, hostnames concealed by fragment concatenation. Package name mimics an internal-looking scoped/branded name for a finance/payments domain.

## What should I do about MAL-2026-13660?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-13660 is a malicious package: sme-rko-finance-front-payments-domain (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-2026-13660/ (Markdown: https://insights.sbomify.com/MAL-2026-13660/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13660

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13660/
Summaries are generated and may contain mistakes; the official description above is the record.