# MAL-2026-12746: Malicious code in devplatform-rest-resources-v2 (npm)


- **Type:** Malicious package
- **Package:** `devplatform-rest-resources-v2` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12746?

MAL-2026-12746 is a malicious package in devplatform-rest-resources-v2, published on 5 Aug 2026. 

### Official description

On require of devplatform-rest-resources-v2, index.js loads _adapter.js which selects a per-OS payload path, fetches an opaque binary over HTTPS from Cloudflare Workers hosts whose names are reconstructed at runtime by joining split string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT fallback resolving base64 payload locations from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names such as.cache_<hex> on POSIX and dotnet_diag_<hex>.exe on Windows, chmod 755'd, and spawned detached via /bin/sh -c or cmd.exe. A sibling lib/telemetry.js contains a second base64->write->chmod->spawn dropper skeleton. The hosts, filenames, and execution path are unrelated to any declared REST-resources purpose.

## What should I do about MAL-2026-12746?

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-2026-12746 is a malicious package: devplatform-rest-resources-v2 (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-2026-12746/ (Markdown: https://insights.sbomify.com/MAL-2026-12746/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12746

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12746/
Summaries are generated and may contain mistakes; the official description above is the record.