# MAL-2026-12863: Malicious code in bnpl-blocks-atom-bnpl-anchor-menu (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-atom-bnpl-anchor-menu` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-h36f-584p-27fc

## What is MAL-2026-12863?

MAL-2026-12863 is a malicious package in bnpl-blocks-atom-bnpl-anchor-menu, published on 5 Aug 2026. 

### Official description

On require of bnpl-blocks-atom-bnpl-anchor-menu, index.js loads _loader.js which assembles hostnames from split-string arrays (evading static analysis), selects a platform-specific asset, and downloads an opaque executable via https.get from Cloudflare Workers subdomains (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT base64 fallback resolving sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /tmp or the Windows temp directory under cover-story names (dotnet_diag_*.exe,.cache_*), chmodded 0755 on POSIX, and spawned detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}).unref() (spawn("cmd") equivalent on Windows). The package's declared purpose is a UI anchor menu, which does not require fetching or executing native binaries from anonymous workers.dev hosts. A sibling module lib/telemetry.js contains a parallel dropper implementation with the same chmod-and-spawn primitives, activating if imported directly. The combination of split-string obfuscation of destination hosts, cover-story staging paths, anonymous workers.dev C2 with a Russian DNS-TXT covert channel, and unconditional execute-on-require constitutes remote code execution against every installer that requires the package.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-12863?

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-2026-12863 is a malicious package: bnpl-blocks-atom-bnpl-anchor-menu (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-2026-12863/ (Markdown: https://insights.sbomify.com/MAL-2026-12863/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12863

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12863/
Summaries are generated and may contain mistakes; the official description above is the record.