# MAL-2026-12571: Malicious code in checkout-mobile-accounts-old (npm)


- **Type:** Malicious package
- **Package:** `checkout-mobile-accounts-old` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12571?

MAL-2026-12571 is a malicious package in checkout-mobile-accounts-old, published on 5 Aug 2026. 

### Official description

On require() of checkout-mobile-accounts-old, index.js loads _support.js which downloads a platform-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT covert-channel fallback under wel1.ru (sdk./ext./pkg./net.dl.wel1.ru), stages the payload under /var/tmp or %TEMP% with disguised filenames (dotnet_diag_*.exe,.cache_*), chmods 0755 on POSIX, and spawns it detached via /bin/sh -c or cmd. The C2 hostnames are assembled at runtime by joining split string literals, and the DNS fallback reassembles a base64-encoded binary from numbered TXT records (c.<domain> for chunk count, 0..n.<domain> for chunks). Environment variables DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, and DO_NOT_TRACK, plus a cooldown flag file, are checked to suppress the fetch. The delivery, obfuscation, disguised staging path, detached execution, and DNS-TXT fallback channel are all unrelated to the package's stated device-integration purpose and constitute full-host remote code execution against any installer that requires the package.

## What should I do about MAL-2026-12571?

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-2026-12571 is a malicious package: checkout-mobile-accounts-old (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-2026-12571/ (Markdown: https://insights.sbomify.com/MAL-2026-12571/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12571

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12571/
Summaries are generated and may contain mistakes; the official description above is the record.