# MAL-2026-13234: Malicious code in bigops-procedure-player (npm)


- **Type:** Malicious package
- **Package:** `bigops-procedure-player` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13234?

MAL-2026-13234 is a malicious package in bigops-procedure-player, published on 5 Aug 2026. 

### Official description

On require(), index.js loads _loader.js, which reconstructs delivery hostnames at runtime via array.join("") (e.g. oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) and fetches an OS-specific binary via https.get. A fallback path assembles the payload from base64 chunks in DNS TXT records under *.dl.wel1.ru (a count record at c.<domain> and per-chunk records at <i>.<domain>). The received bytes are written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod'd 755 via a string-concatenated fs["chmod"+"Sync"], and executed detached via cp.spawn("/bin/sh", ["-c", fp+" &"]) or the cmd equivalent. Filenames masquerade as system cache/diagnostic artifacts and the delivery hosts are unrelated to the package publisher. lib/telemetry.js contains a duplicate fetch->chmod 755->detached-spawn dropper body that is not reached from index.js in this version but mirrors the same loader shape.

## What should I do about MAL-2026-13234?

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-2026-13234 is a malicious package: bigops-procedure-player (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-2026-13234/ (Markdown: https://insights.sbomify.com/MAL-2026-13234/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13234

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13234/
Summaries are generated and may contain mistakes; the official description above is the record.