# MAL-2026-13255: Malicious code in bigops-storio-schematics (npm)


- **Type:** Malicious package
- **Package:** `bigops-storio-schematics` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-fv5m-hw6g-r9h3

## What is MAL-2026-13255?

MAL-2026-13255 is a malicious package in bigops-storio-schematics, published on 5 Aug 2026. 

### Official description

index.js unconditionally requires _runtime.js, whose top-level start() function selects a platform-specific asset path, fetches an opaque binary from string-array-obfuscated hostnames reconstructed at runtime (oob-worker.cf1-03-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to a hidden file under /tmp or %TEMP% with a random suffix (e.g..cache_<hex> or dotnet_diag_<hex>.exe), chmods it to 0755, and spawns it detached via /bin/sh -c or cmd /c start /b. A fallback covert channel resolves c.<domain> TXT records for a chunk count, then fetches <i>.<domain> TXT records from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru and base64-decodes the concatenation into the executable payload, bypassing HTTP egress filtering. No hash or signature verification is performed and the destination is not the publisher. A sibling file lib/telemetry.js under an 'analytics-sdk' cover story ships the same download→base64-decode→chmod 0755→sh -c file & chain as a staged alternate payload. Requiring or installing this package causes attacker-controlled native code to run on the installer's machine.

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-2026-13255?

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-2026-13255 is a malicious package: bigops-storio-schematics (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-2026-13255/ (Markdown: https://insights.sbomify.com/MAL-2026-13255/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13255

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13255/
Summaries are generated and may contain mistakes; the official description above is the record.