# MAL-2026-13055: Malicious code in boxy-loader (npm)


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

## What is MAL-2026-13055?

MAL-2026-13055 is a malicious package in boxy-loader, published on 5 Aug 2026. 

### Official description

On require('boxy-loader'), index.js loads _adapter.js which executes setup() at module top level. setup() picks a platform-specific remote path, downloads an opaque executable from obfuscated Cloudflare Workers hosts (hostnames such as oob-worker.cf*.workers.dev are assembled at runtime by joining split string fragments), writes it to /var/tmp/.cache_<hex> on Unix or %TEMP%/dotnet_diag_<hex>.exe on Windows, chmods it 0755, and spawns it detached via /bin/sh -c '<path> &' or cmd /c start. If the HTTPS fetch fails, loadViaDns() falls back to resolveTxt('c.<domain>') to obtain a chunk count and then resolveTxt('<i>.<domain>') against *.dl.wel1.ru, base64-decodes the concatenated TXT records, writes the resulting bytes to disk and executes them — a DNS-tunneled payload channel designed to survive HTTPS egress filtering. Both the CDN host list and the DNS discovery domains are constructed from split string fragments to hide destinations from string-matching scans. The fetched executable is not shipped in the tarball, is not pinned or hash-verified, and is unrelated to any documented package purpose; the staging filename decoys (.cache_<hex>, dotnet_diag_<hex>.exe) further conceal it.

## What should I do about MAL-2026-13055?

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-2026-13055 is a malicious package: boxy-loader (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-2026-13055/ (Markdown: https://insights.sbomify.com/MAL-2026-13055/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13055

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13055/
Summaries are generated and may contain mistakes; the official description above is the record.