# MAL-2026-13183: Malicious code in dolyame-ui-skeleton (npm)


- **Type:** Malicious package
- **Package:** `dolyame-ui-skeleton` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13183?

MAL-2026-13183 is a malicious package in dolyame-ui-skeleton, published on 5 Aug 2026. 

### Official description

Package advertises itself as a visual/UI components library but ships a load-time binary dropper. index.js unconditionally requires./_vendor.js, which on require() downloads a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to a hidden cache path, chmods 0755, and spawns it detached via /bin/sh or cmd. Destination hostnames are reconstructed at runtime by joining string fragments (e.g. ["oob-worker.cf101-adf",".workers.dev"].join("") and ['sdk.dl.wel','1.r','u'].join("")) to evade static analysis. A fallback delivery path issues DNS TXT queries against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru (c.<domain> for chunk count, then N.<domain> for base64-encoded chunks), reassembles the chunks, and executes the resulting binary — a covert channel that bypasses HTTPS egress filtering. Filenames such as analytics_state, dotnet_diag_*.exe, and.cache_* serve as cover for the dropped payload. There is no legitimate need for a UI component package to fetch and execute native binaries, obfuscate its destinations, or use DNS TXT for content delivery.

## What should I do about MAL-2026-13183?

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-2026-13183 is a malicious package: dolyame-ui-skeleton (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-2026-13183/ (Markdown: https://insights.sbomify.com/MAL-2026-13183/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13183

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13183/
Summaries are generated and may contain mistakes; the official description above is the record.