# MAL-2026-12775: Malicious code in devplatform-spa-plugin-root-devtools (npm)


- **Type:** Malicious package
- **Package:** `devplatform-spa-plugin-root-devtools` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12775?

MAL-2026-12775 is a malicious package in devplatform-spa-plugin-root-devtools, published on 5 Aug 2026. 

### Official description

On require() of the package, index.js side-loads _compat.js which downloads a platform-specific executable from obfuscated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT covert-channel fallback that queries *.dl.wel1.ru domains (sdk/ext/pkg/net.dl.wel1.ru) to reassemble base64-encoded payload chunks. Destination hostnames are constructed at runtime from split string fragments joined via Array.join to evade static analysis. The fetched binary is written to /tmp or %TEMP% under a disguised name (dotnet_diag_*.exe,.cache_*), chmod 0755 on POSIX, and spawned detached via /bin/sh -c or cmd.exe start /b with unref(). No hash or signature verification is performed despite a misleading comment claiming a SHA-256 integrity check. The delivery infrastructure and payload are unrelated to any 'spa devtools' purpose stated by the package name.

## What should I do about MAL-2026-12775?

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-2026-12775 is a malicious package: devplatform-spa-plugin-root-devtools (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-2026-12775/ (Markdown: https://insights.sbomify.com/MAL-2026-12775/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12775

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12775/
Summaries are generated and may contain mistakes; the official description above is the record.