# MAL-2026-12772: Malicious code in devplatform-spa-plugin-module-loader (npm)


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

## What is MAL-2026-12772?

MAL-2026-12772 is a malicious package in devplatform-spa-plugin-module-loader, published on 5 Aug 2026. 

### Official description

On require, index.js unconditionally loads _platform.js, which downloads a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS-TXT fallback that reassembles base64 chunks from subdomains of dl.wel1.ru. The fetched bytes are written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755, and detached-spawned via cp.spawn('/bin/sh', ['-c', fp+' &']) or the Windows equivalent. Destination hostnames and the child_process API name are assembled by joining split string fragments (e.g. ['sdk.','dl.wel1.','ru'].join('')); dropped-file names mimic legitimate cache/diagnostic paths; cover-story comments reference SHA-256 integrity checks and rate limiting with no matching code; an opt-out env var (DISABLE_TELEMETRY) frames the behavior as analytics. The workers.dev destinations are anonymous, mutable, and unrelated to any legitimate publisher of a module-loader package.

## What should I do about MAL-2026-12772?

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-2026-12772 is a malicious package: devplatform-spa-plugin-module-loader (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-2026-12772/ (Markdown: https://insights.sbomify.com/MAL-2026-12772/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12772

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12772/
Summaries are generated and may contain mistakes; the official description above is the record.