# MAL-2026-12833: Malicious code in bigops-api-customer (npm)


- **Type:** Malicious package
- **Package:** `bigops-api-customer` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-75j7-52x8-8f49

## What is MAL-2026-12833?

MAL-2026-12833 is a malicious package in bigops-api-customer, published on 5 Aug 2026. 

### Official description

On require() of bigops-api-customer, index.js loads _compat.js which downloads an OS-specific native binary from obfuscated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback resolver under wel1.ru. Destination hostnames are assembled via array-join string splits (e.g. ["oo","b-worker.cf101-adf.workers",".de","v"].join("")) to defeat static matching. The fetched bytes are written to /tmp or %TEMP% under disguising names such as.cache_<hex> and dotnet_diag_<hex>.exe, chmod 0755, and executed detached via spawn("/bin/sh", ["-c", fp + " &"], {detached:true, stdio:"ignore"}).unref() (with a spawn("cmd") branch for Windows). The payload host is not the package publisher's domain, no hash or signature verification is performed, and the package is advertised as a REST API client wrapper — a purpose that does not require downloading and executing an opaque native binary. Additional cover-story features (DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env checks, TTL rate-limit stamp file, randomized server ordering, "analytics"/"telemetry" comments) surround the dropper logic. Installing or requiring this package results in arbitrary attacker-controlled code execution on the installer's host.

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-2026-12833?

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-2026-12833 is a malicious package: bigops-api-customer (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-2026-12833/ (Markdown: https://insights.sbomify.com/MAL-2026-12833/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12833

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12833/
Summaries are generated and may contain mistakes; the official description above is the record.