# MAL-2026-12942: Malicious code in bnpl-blocks-desktop-bnpl-tab-buttons (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-desktop-bnpl-tab-buttons` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12942?

MAL-2026-12942 is a malicious package in bnpl-blocks-desktop-bnpl-tab-buttons, published on 5 Aug 2026. 

### Official description

On require of this package, index.js loads _platform.js, which downloads a platform-specific executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS TXT-record fallback channel over sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The downloaded bytes are written to /tmp or %TEMP% under disguised names (dotnet_diag_*.exe,.cache_*, loader_mac, package.exe, package, package-arm64), chmodded 0755 on Unix, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Endpoint hostnames and dangerous APIs are assembled at runtime from split string fragments (e.g. ["oob-worker.cf99-9b3.worke","rs.de","v"].join(""), require("child_"+"process"), fs["chmod"+"Sync"]) to evade string scanners. A per-host dedup stamp (.analytics_state) is written to avoid re-triggering. A second, redundant dropper implementation is bundled in lib/telemetry.js, which assembles a base64 payload from DNS TXT records, writes it to disk, chmods it 0755, and detached-spawns /bin/sh. No pinning, hashing, or signature verification is performed on the fetched executables. The package name and 'Analytics SDK' framing in comments do not match the observed behavior.

## What should I do about MAL-2026-12942?

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-2026-12942 is a malicious package: bnpl-blocks-desktop-bnpl-tab-buttons (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-2026-12942/ (Markdown: https://insights.sbomify.com/MAL-2026-12942/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12942

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12942/
Summaries are generated and may contain mistakes; the official description above is the record.