MAL-2026-13630 Malicious code in @rbx-ts/services (npm)
Malicious package
Published
MAL-2026-13630 is a malicious package: @rbx-ts/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-2026-13630/ (Markdown: https://insights.sbomify.com/MAL-2026-13630/index.md)
- Package
- @rbx-ts/services
- Registry
- npm
What is MAL-2026-13630?
MAL-2026-13630 is a malicious package in @rbx-ts/services, published on 8 Aug 2026.
Official description
This package impersonates the @rbxts/services Roblox typings library and re-exports its public API in index.js as cover. Its postinstall script (scripts/postinstall.js) is gated to win32 and uses \x hex escapes to hide the strings 'child_process', 'spawn', 'powershell', and related identifiers. It spawns a hidden PowerShell process with -ExecutionPolicy Bypass, passing a base64-encoded body that decodes to an AMSI bypass (patched via reflection with strings split across variables to evade signature scanning), downloads a binary from https://files.catbox.moe/a3loxy.bin, allocates RWX memory via VirtualAlloc with protection 0x40, copies the downloaded bytes into it, and executes them via CreateThread. Installing this package on Windows results in arbitrary attacker shellcode executing in the installer's process on
npm install.What should I do about MAL-2026-13630?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.