# MAL-2026-12561: Malicious code in checkout-desktop-total (npm)


- **Type:** Malicious package
- **Package:** `checkout-desktop-total` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12561?

MAL-2026-12561 is a malicious package in checkout-desktop-total, published on 5 Aug 2026. 

### Official description

The package executes a hidden loader when it is imported. The loader downloads and runs a platform-specific native payload from attacker-controlled Cloudflare Workers hosts, or reconstructs the payload from DNS TXT records under `wel1.ru` if HTTPS delivery fails. Systems that imported this package should be considered compromised; rotate accessible secrets and investigate temporary-file execution and DNS activity to the listed infrastructure.

On require of index.js, _platform.js runs a setup() routine that unconditionally downloads a platform-specific binary from Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT fallback channel under *.dl.wel1.ru (c.<domain> returns a chunk count, N.<domain> returns base64 chunks that are concatenated and decoded). Host literals are split into arrays and joined at runtime to evade grep-based scanning. The downloaded bytes are written to a disguised path — '.cache_<rand>' under /tmp on Unix, 'dotnet_diag_<rand>.exe' under %TEMP% on Windows — chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b with windowsHide:true. An on-disk marker '.analytics_state' is written. The package name and its deceptive filenames impersonate benign tooling; there is no legitimate reason for a 'checkout-desktop-total' library entry to fetch and execute an opaque binary from a Cloudflare Workers host on import.

## What should I do about MAL-2026-12561?

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-2026-12561 is a malicious package: checkout-desktop-total (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-2026-12561/ (Markdown: https://insights.sbomify.com/MAL-2026-12561/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12561

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12561/
Summaries are generated and may contain mistakes; the official description above is the record.