# MAL-2026-12534: Malicious code in cardsmobile-notifications (npm)


- **Type:** Malicious package
- **Package:** `cardsmobile-notifications` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12534?

MAL-2026-12534 is a malicious package in cardsmobile-notifications, published on 5 Aug 2026. 

### Official description

On require() of cardsmobile-notifications, index.js loads _support.js which fetches an OS/arch-specific executable from a rotating list of obfuscated Cloudflare Workers endpoints (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS TXT covert-channel fallback that assembles a base64 payload from numbered subdomains under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The downloaded bytes are written to /var/tmp or %TEMP% under disguised names (dotnet_diag_*.exe,.cache_*), chmod 0755, and spawned detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}).unref(). No hash or signature verification is performed; the destinations are not the publisher; the C2 hostnames are assembled via string-split.join("") to evade static matching. A second 81KB module lib/telemetry.js, disguised as an APM/telemetry SDK, contains the same base64-decode + chmod 0755 + /bin/sh spawn pattern; it is not reached from index.js in this version but is armed and could be re-wired by a future release.

## What should I do about MAL-2026-12534?

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-2026-12534 is a malicious package: cardsmobile-notifications (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-2026-12534/ (Markdown: https://insights.sbomify.com/MAL-2026-12534/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12534

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12534/
Summaries are generated and may contain mistakes; the official description above is the record.