# MAL-2026-13072: Malicious code in boxy-mmb-types (npm)


- **Type:** Malicious package
- **Package:** `boxy-mmb-types` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13072?

MAL-2026-13072 is a malicious package in boxy-mmb-types, published on 5 Aug 2026. 

### Official description

index.js unconditionally require()s _loader.js on module load. _loader.js reconstructs hostnames by joining split string fragments (evading static grep) to build endpoints under oob-worker.cf*.workers.dev with a DNS-TXT fallback via *.dl.wel1.ru, fetches a platform-specific native binary via https.get, writes it to /var/tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods it 0755, and spawns it detached via /bin/sh -c "<path> &" or cmd /c start. A TTL marker gates re-execution. A bundled lib/telemetry.js (~81 KB) is not imported by any code path and functions as decoy content to make the package resemble a legitimate telemetry wrapper. The obfuscated hostname assembly, disguised filenames, no-op stderr writer, and DNS covert-channel fallback are attacker anti-analysis patterns paired with the drop-and-execute chain.

## What should I do about MAL-2026-13072?

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-2026-13072 is a malicious package: boxy-mmb-types (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-2026-13072/ (Markdown: https://insights.sbomify.com/MAL-2026-13072/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13072

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13072/
Summaries are generated and may contain mistakes; the official description above is the record.