# MAL-2024-1783: Malicious code in auth0.net (npm)


- **Type:** Malicious package
- **Package:** `auth0.net` (npm)
- **Published:** 25 Jun 2024

## What is MAL-2024-1783?

MAL-2024-1783 is a malicious package in auth0.net, published on 25 Jun 2024. 

### Official description

On `npm install`, package.json's `preinstall` (and `preupdate`/`test`) hook runs `nslookup bkxajsfkvlurhaoeotqbqf3fg2sitbxll.oast.fun`. The destination `oast.fun` is the Project Discovery interactsh out-of-band callback service used to confirm code execution on victim hosts via a unique DNS subdomain. Firing automatically on install leaks the installer's existence and the corporate DNS resolver's egress IP to an attacker-controlled nameserver, with the unique subdomain serving as a per-victim correlation token. The package itself is hollow — `index.js` is empty, `description` is the placeholder 'Internal package', and `author` is 'Team' — and the package name `auth0.net` impersonates the Auth0 brand, consistent with a dependency-confusion attempt against an internal Auth0/.NET package name. The DNS beacon is the recon stage of that attack: the operator learns which organizations have misconfigured their registry resolution to pull this public package instead of an internal one, enabling targeted follow-on compromise.

## What should I do about MAL-2024-1783?

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-2024-1783 is a malicious package: auth0.net (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-2024-1783/ (Markdown: https://insights.sbomify.com/MAL-2024-1783/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2024-1783

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From sbomify Insights: https://insights.sbomify.com/MAL-2024-1783/
Summaries are generated and may contain mistakes; the official description above is the record.