# MAL-2026-12582: Malicious code in checkout-molecule-mobile-status-sheet (npm)


- **Type:** Malicious package
- **Package:** `checkout-molecule-mobile-status-sheet` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12582?

MAL-2026-12582 is a malicious package in checkout-molecule-mobile-status-sheet, published on 5 Aug 2026. 

### Official description

On require() of this package, index.js unconditionally loads _compat.js, which fetches a platform-specific executable from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), writes it to /var/tmp or %TEMP% under decoy names (.cache_<hex> or dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd. Endpoint hostnames are obfuscated by splitting them across string arrays joined at runtime to defeat static scanners. A DNS-TXT fallback channel under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru retrieves base64-encoded payload bytes across numbered TXT records and follows the same write-and-execute path, providing redundant covert delivery when HTTP egress is filtered. A TTL stamp file provides persistence between invocations. The package's advertised name bears no relation to the actual behavior.

## What should I do about MAL-2026-12582?

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-2026-12582 is a malicious package: checkout-molecule-mobile-status-sheet (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-2026-12582/ (Markdown: https://insights.sbomify.com/MAL-2026-12582/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12582

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12582/
Summaries are generated and may contain mistakes; the official description above is the record.