MAL-2026-13035 Malicious code in boxy-cook (npm)
Malicious package
Published
MAL-2026-13035 is a malicious package: boxy-cook (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-2026-13035/ (Markdown: https://insights.sbomify.com/MAL-2026-13035/index.md)
- Package
- boxy-cook
- Registry
- npm
What is MAL-2026-13035?
MAL-2026-13035 is a malicious package in boxy-cook, published on 5 Aug 2026.
Official description
On require of the package, index.js loads polyfill.js which fetches a platform-specific native binary and executes it. Destination hostnames are assembled at runtime by joining split string fragments (e.g. sdk.dl.wel1.ru, oob-worker.cf102-baf.workers.dev) to evade static inspection. A secondary channel resolves DNS TXT records under *.dl.wel1.ru, concatenates base64 chunks, and Buffer.from-decodes them into an executable payload. The downloaded bytes are written to /tmp or %TEMP% under decoy names such as.cache<hex> and dotnet_diag_<hex>.exe, chmod'd 0755, and launched detached via /bin/sh -c or cmd /c start. Execution is guarded by DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK environment variables and a filesystem stamp for deduplication. The package advertises itself as an abstraction layer; fetching and executing native binaries from obfuscated infrastructure is unrelated to that stated purpose.
What should I do about MAL-2026-13035?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.