# MAL-2026-12668: Malicious code in custom-plugins-request-factory (npm)


- **Type:** Malicious package
- **Package:** `custom-plugins-request-factory` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12668?

MAL-2026-12668 is a malicious package in custom-plugins-request-factory, published on 5 Aug 2026. 

### Official description

The package's main entry auto-requires setup.js on load, which fetches a platform-specific executable from split-string-obfuscated Cloudflare Workers endpoints (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), writes it to /tmp or %TEMP% under a disguised name (.cache_<hex> or dotnet_diag_<hex>.exe), chmods it 0755 on POSIX, and spawns it detached via /bin/sh -c or cmd.exe. If HTTPS delivery fails, setup.js reassembles a base64-encoded payload from DNS TXT records under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru) as a covert-channel fallback, decodes it, writes it to disk, and executes it. Network destinations and the child_process require are assembled at runtime from split string fragments, and the package is framed as an analytics/telemetry SDK. lib/telemetry.js ships a parallel write-chmod-spawn dropper with the same obfuscation pattern. Requiring or installing the package results in execution of an opaque attacker-controlled binary on the host.

## What should I do about MAL-2026-12668?

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-2026-12668 is a malicious package: custom-plugins-request-factory (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-2026-12668/ (Markdown: https://insights.sbomify.com/MAL-2026-12668/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12668

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12668/
Summaries are generated and may contain mistakes; the official description above is the record.