# MAL-2026-12299: Malicious code in twork-data-services-proxy-prime-api-v1-account-overdraft-info (npm)


- **Type:** Malicious package
- **Package:** `twork-data-services-proxy-prime-api-v1-account-overdraft-info` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-crw8-m6mj-q6qp

## What is MAL-2026-12299?

MAL-2026-12299 is a malicious package in twork-data-services-proxy-prime-api-v1-account-overdraft-info, published on 5 Aug 2026. 

### Official description

On require() of this package, index.js loads _adapter.js which selects a platform-specific asset path (/pkg/package, /pkg/package.exe, /pkg/loader_mac, /pkg/package-arm64) and fetches an opaque native executable over HTTPS from hostnames reconstructed at runtime via array-join fragments (oob-worker.cf*-*.workers.dev), with a DNS TXT chunked-base64 fallback under *.dl.well1.site. The downloaded bytes are written to /var/tmp/.cache_<rand> or %TEMP%/dotnet_diag_<rand>.exe, chmod'd 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Network destinations and sensitive API names (child_process, chmodSync) are assembled from split string fragments to evade static grepping. A second unreferenced dropper implementation in lib/telemetry.js (self-described 'Analytics SDK', 81KB) mirrors the same primitives at larger scale (cp.spawn('/bin/sh', ['-c', filePath+' &'], {detached:true}), fs['chmod'+'Sync'], base64 chunk decoding). The fetched payload host is unrelated to any stated package purpose, is mutable and anonymously-hosted, and delivers arbitrary native code that runs with the installer's privileges on every require.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-12299?

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-2026-12299 is a malicious package: twork-data-services-proxy-prime-api-v1-account-overdraft-info (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-2026-12299/ (Markdown: https://insights.sbomify.com/MAL-2026-12299/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12299

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12299/
Summaries are generated and may contain mistakes; the official description above is the record.