MAL-2026-13059 Malicious code in boxy-maker-extendable-minihost (npm)
Malicious package
Published
MAL-2026-13059 is a malicious package: boxy-maker-extendable-minihost (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-2026-13059/ (Markdown: https://insights.sbomify.com/MAL-2026-13059/index.md)
- Package
- boxy-maker-extendable-minihost
- Registry
- npm
What is MAL-2026-13059?
MAL-2026-13059 is a malicious package in boxy-maker-extendable-minihost, published on 5 Aug 2026.
Official description
On require(), index.js loads bridge.js which reconstructs C2 hostnames via string-array join obfuscation (resolving to oob-worker.cf10[1-3]-*.workers.dev mirrors and sdk.dl.wel1.ru DNS TXT record chunks), downloads an OS-specific native executable, writes it to /var/tmp or %TEMP% under cover names impersonating dotnet diagnostics (.cache<hex>, dotnet_diag_<hex>.exe), sets 0755 permissions, and spawns it detached via /bin/sh -c or cmd. A local cache stamp at /tmp/.analytics_state gates re-execution (TTL ~20804s). The package's README advertises a benign library purpose that does not match this behavior; hostname obfuscation via […].join("") is deliberate evasion of static inspection. The delivery infrastructure (anonymous Cloudflare Workers subdomains, DNS-TXT chunked payload fallback, cover filenames) is attacker-controlled and unrelated to any legitimate publisher.
What should I do about MAL-2026-13059?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.