# MAL-2026-18338: Malicious code in @azure-growth/signup-ux-components (npm)


- **Type:** Malicious package
- **Package:** `@azure-growth/signup-ux-components` (npm)
- **Published:** 27 Oct 2026

## What is MAL-2026-18338?

MAL-2026-18338 is a malicious package in @azure-growth/signup-ux-components, published on 27 Oct 2026. 

### Official description

@azure-growth/signup-ux-components 1.2.2, 1.2.3 and 2.9.9 are dependency-confusion packages that take the name of a package used internally by Microsoft's Azure signup site and not published on the npm registry; 2.9.9 carries a version number above the internal release, so resolvers that also check the public registry prefer it. Their `preinstall` script runs `node index.js`, which reads the OS username and hostname and sends them in a DNS lookup of `msrc-poc.<user>.<hostname>.dbg6vplohjpkmtolbi6g18ekofkxjzm4s.oast.fun`, an out-of-band interaction collector; `index.js` is also the package entry point, so the lookup repeats whenever the package is required. Any machine that installed one of these versions has disclosed its username and hostname to a third party. The earlier `0.0.0-stage` version is an inert placeholder and is not affected.

The package declares a preinstall script that executes index.js on `npm install`. The script reads os.userInfo().username and os.hostname() and encodes them into a DNS label of the form `msrc-poc.${user}.${host}.dbg6vplohjpkmtolbi6g18ekofkxjzm4s.oast.fun`, then issues a DNS lookup for that name. The oast.fun host is an interactsh out-of-band collector, and the lookup transmits the installer's OS login name and hostname to that collector automatically at install time, without consent or configuration. The @azure-growth scope resembles an internal Microsoft namespace, consistent with a dependency-confusion beacon targeting internal build systems. No code is fetched or executed from the collector in this version, but installer identity is leaked on every install.

The OpenSSF Package Analysis project identified '@azure-growth/signup-ux-components' @ 1.2.2 (npm) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.

## What should I do about MAL-2026-18338?

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-2026-18338 is a malicious package: @azure-growth/signup-ux-components (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-2026-18338/ (Markdown: https://insights.sbomify.com/MAL-2026-18338/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-18338

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-18338/
Summaries are generated and may contain mistakes; the official description above is the record.