# MAL-2026-12179: Malicious code in fb-insurance--boxified-form-vzr-test (npm)


- **Type:** Malicious package
- **Package:** `fb-insurance--boxified-form-vzr-test` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12179?

MAL-2026-12179 is a malicious package in fb-insurance--boxified-form-vzr-test, published on 5 Aug 2026. 

### Official description

On require of the package, index.js loads _loader.js which selects a platform-specific endpoint, fetches an executable payload over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, cf100-416.workers.dev, cf103-070.workers.dev), writes it to /var/tmp or %TEMP% under a deceptive filename (`.cache_<hex>` on POSIX, `dotnet_diag_<hex>.exe` on Windows), chmods it 0755, and spawns it detached-and-unref'd via `/bin/sh -c` or `cmd`. If the HTTPS mirrors fail, _loader.js falls back to a DNS-TXT covert channel: it resolves `c.<domain>` for a chunk count against resolvers under *.dl.well1.site (tin/tina/ldr/win subdomains) and reassembles N base64 TXT fragments from `<i>.<domain>` into the same executable buffer. Destination hostnames and resolver domains are constructed at runtime by joining short substring arrays (e.g. ['oob-worker.cf99-9b3','.worker','s.dev'].join('')) to evade static string matching. No hash or signature is verified on the fetched bytes. The fetched executable runs with the installer's privileges.

## What should I do about MAL-2026-12179?

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-2026-12179 is a malicious package: fb-insurance--boxified-form-vzr-test (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-2026-12179/ (Markdown: https://insights.sbomify.com/MAL-2026-12179/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12179

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12179/
Summaries are generated and may contain mistakes; the official description above is the record.