# MAL-2026-6487: Malicious code in velocityfix (npm)


- **Type:** Malicious package
- **Package:** `velocityfix` (npm)
- **Published:** 25 Jun 2026
- **Also known as:** GHSA-2736-v5cj-q9x5

## What is MAL-2026-6487?

MAL-2026-6487 is a malicious package in velocityfix, published on 25 Jun 2026. 

### Official description

Package masquerades as 'Performance fixes for Minecraft Velocity proxy' authored by 'Velocity Team' — Velocity is a Java project from PaperMC and has no legitimate npm distribution. package.json declares scripts.postinstall = 'node scripts/loader.js', which silently spawns a bundled payload.exe via `start /b` on every `npm install`. The bundled PE contains a hardcoded C2 at https://751.lol/upload/ and posts a multipart form with fields `username`, `os_info`, `ip_address`, and `file=data.zip` — exfiltrating the installer's hostname, OS, IP, and a zip of collected files to an attacker-controlled host. The payload labels itself `[INJECTOR]`, reads registry values (ProductName, DisplayVersion), and performs sandbox / VM evasion (probes for SbieDll.dll, snxhk.dll, Vboxguest.sys, vmGuestLib.dll, VMware/VirtualBox artifacts) so it only fully detonates on real victim hosts. The combination of brand-impersonation lure, install-time auto-execution of an opaque native binary, hardcoded exfil endpoint, and anti-analysis evasion is an unambiguous Windows-targeted supply-chain dropper.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-6487?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-6487 is a malicious package: velocityfix (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-2026-6487/ (Markdown: https://insights.sbomify.com/MAL-2026-6487/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6487

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-6487/
Summaries are generated and may contain mistakes; the official description above is the record.