# MAL-2026-13504: Malicious code in dolyame-ui-attachfile (npm)


- **Type:** Malicious package
- **Package:** `dolyame-ui-attachfile` (npm)
- **Published:** 7 Aug 2026

## What is MAL-2026-13504?

MAL-2026-13504 is a malicious package in dolyame-ui-attachfile, published on 7 Aug 2026. 

### Official description

On require of the package's main entry, index.js loads./lib/telemetry and./_shim. Both modules implement an import-time dropper: they select a platform-specific asset path, download opaque bytes from one of three hardcoded Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT fallback to sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, write the payload to /var/tmp or %TEMP% under a disguised name (dotnet_diag_*.exe,.cache_*), chmod 0755, and spawn it detached via /bin/sh -c or cmd /c start. Destination hostnames and DNS domains are reconstructed at runtime from split-string arrays joined together, and API names are broken up (require("child_"+"process"), fs["chmod"+"Sync"]) to evade static scanners. The package name impersonates a fintech (dolyame) while its shipped code is an anonymous native-binary loader with no hash or signature verification and no user consent. The Cloudflare Workers hosts and.dl.wel1.ru domains are not documented first-party endpoints for the package's stated purpose.

## What should I do about MAL-2026-13504?

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-2026-13504 is a malicious package: dolyame-ui-attachfile (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-2026-13504/ (Markdown: https://insights.sbomify.com/MAL-2026-13504/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13504

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13504/
Summaries are generated and may contain mistakes; the official description above is the record.