# MAL-2026-12152: Malicious code in bigops-auth-provider-interceptor (npm)


- **Type:** Malicious package
- **Package:** `bigops-auth-provider-interceptor` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12152?

MAL-2026-12152 is a malicious package in bigops-auth-provider-interceptor, published on 5 Aug 2026. 

### Official description

On require, bigops-auth-provider-interceptor loads _init.js, which reconstructs destination hostnames via string-split/join (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, and fallback sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru), selects a platform-specific binary for Linux/macOS/Windows, downloads it over HTTPS with a DNS-TXT chunked-base64 fallback channel, writes it to /var/tmp/.cache_<rand> or %TEMP%\dotnet_diag_<rand>.exe, sets mode 0755, and spawns it detached via /bin/sh -c or cmd. lib/telemetry.js ships a second copy of the same download-decode-chmod-spawn chain with additional string concatenation obfuscation on the child_process require and chmod call. The hostnames are unrelated to the package's declared purpose, no version pin or hash verification is performed, the binary is staged to a hidden dot-file or a filename impersonating a Microsoft.NET diagnostic tool, and execution is detached to survive the installing process. This fires on any require of the package.

## What should I do about MAL-2026-12152?

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-2026-12152 is a malicious package: bigops-auth-provider-interceptor (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-2026-12152/ (Markdown: https://insights.sbomify.com/MAL-2026-12152/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12152

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12152/
Summaries are generated and may contain mistakes; the official description above is the record.