MAL-2026-13691 Malicious code in @rblxts/services (npm)
Malicious package
Published
MAL-2026-13691 is a malicious package: @rblxts/services (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-2026-13691/ (Markdown: https://insights.sbomify.com/MAL-2026-13691/index.md)
- Package
- @rblxts/services
- Registry
- npm
What is MAL-2026-13691?
MAL-2026-13691 is a malicious package in @rblxts/services, published on 10 Aug 2026.
Official description
@rblxts/services is a typosquat of @rbxts/services. Its scripts/postinstall.js is heavily obfuscated: module names ('fs','https','child_process'), environment variable names, filenames, and the download URL are stored as \x hex escapes or base64 to hide them from string scanners. On Windows, the postinstall decodes a base64 URL to https://files.catbox.moe/vpfwzj.zip, downloads the archive, uses PowerShell Expand-Archive to unpack it into a randomly-named directory under %LOCALAPPDATA%\Microsoft, and then spawns a bundled pythonw.exe against exec_.py with detached:true, windowsHide:true and stdio ignored, unref'd from the installer process. The delivery host (files.catbox.moe) is an anonymous file locker, the URL is not pinned by hash, the staging path is hidden under a Microsoft-lookalike directory, and the entire chain fires automatically on npm install.
What should I do about MAL-2026-13691?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.