# MAL-2026-13547: Malicious code in devplatform-spa-plugin-remote-module (npm)


- **Type:** Malicious package
- **Package:** `devplatform-spa-plugin-remote-module` (npm)
- **Published:** 7 Aug 2026

## What is MAL-2026-13547?

MAL-2026-13547 is a malicious package in devplatform-spa-plugin-remote-module, published on 7 Aug 2026. 

### Official description

On require of the package, index.js loads _support.js which downloads a platform-specific binary from string-split-obfuscated hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT fallback that reassembles a base64 payload from numbered subdomains under dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched binary is written to /var/tmp on Unix or %TEMP% on Windows under a disguised name (.cache_<hex> or dotnet_diag_<hex>.exe), chmodded 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start. Host strings and API names are reconstructed at runtime from array-join fragments (e.g., ["oob-worker.cf103-070.work","ers.d","ev"].join("")) to evade static analysis. A second module lib/telemetry.js ships the same dropper primitives with require("child_" + "process") and fs["chmod"+"Sync"] indirection, bundled as a ready-to-wire payload alongside the active dropper.

## What should I do about MAL-2026-13547?

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-2026-13547 is a malicious package: devplatform-spa-plugin-remote-module (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-2026-13547/ (Markdown: https://insights.sbomify.com/MAL-2026-13547/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13547

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13547/
Summaries are generated and may contain mistakes; the official description above is the record.