MAL-2026-13044 Malicious code in boxy-fixture (npm)
Malicious package
Published
MAL-2026-13044 is a malicious package: boxy-fixture (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-2026-13044/ (Markdown: https://insights.sbomify.com/MAL-2026-13044/index.md)
- Package
- boxy-fixture
- Registry
- npm
What is MAL-2026-13044?
MAL-2026-13044 is a malicious package in boxy-fixture, published on 5 Aug 2026.
Official description
On require() of the package, index.js loads support.js which executes setup() at module load. The code reconstructs Cloudflare Workers hostnames (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) from split-string arrays, downloads a platform-specific binary via https.get, 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 or cmd.exe /c start with unref(). A DNS-TXT covert-channel fallback reconstructs the payload from base64-encoded TXT records under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru (chunk count from c.<domain>, chunks from <i>.<domain>). A second copy of the dropper primitives (base64 chunk assembly, chmodSync 0755 via string concatenation, detached /bin/sh -c spawn) is bundled in lib/telemetry.js under an 'Analytics SDK' label. Filenames masquerade as analytics_state and dotnet_diag_*.exe.
What should I do about MAL-2026-13044?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.