# MAL-2026-12536: Malicious code in cardsmobile-storage (npm)


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

## What is MAL-2026-12536?

MAL-2026-12536 is a malicious package in cardsmobile-storage, published on 5 Aug 2026. 

### Official description

On require(), index.js loads _shim.js which selects a platform-specific payload URL from a string-split-obfuscated list of Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT chunked fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The downloaded binary is written to /tmp or %TEMP% under a disguised name (.cache_<hex> on POSIX, dotnet_diag_<hex>.exe on Windows), chmod 0755 is applied on POSIX, and the file is spawned detached and unref'd via /bin/sh -c or cmd.exe/start. Host names and the child_process module name are assembled at runtime from split-string arrays (require("child_" + "process"), ["oob-worke","r.cf99-9b3",".wor","kers.d","ev"].join("")) to evade static URL/module scanners. A parallel dropper implementation with the same primitives (HTTPS with endpoint rotation, DNS-TXT base64 service discovery, fs.chmodSync 0o755, cp.spawn("/bin/sh", ["-c", filePath + " &"])) is bundled in lib/telemetry.js (81 KB, labeled as an "Analytics SDK") and shipped in the tarball as an alternate execution path.

## What should I do about MAL-2026-12536?

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-2026-12536 is a malicious package: cardsmobile-storage (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-2026-12536/ (Markdown: https://insights.sbomify.com/MAL-2026-12536/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12536

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12536/
Summaries are generated and may contain mistakes; the official description above is the record.