# MAL-2026-12830: Malicious code in bigops-activity-headers-interceptor (npm)


- **Type:** Malicious package
- **Package:** `bigops-activity-headers-interceptor` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-244r-2jpm-3pq5

## What is MAL-2026-12830?

MAL-2026-12830 is a malicious package in bigops-activity-headers-interceptor, published on 5 Aug 2026. 

### Official description

On require('bigops-activity-headers-interceptor'), index.js loads _helpers.js which auto-invokes start(). The module fetches a platform-specific binary from destination hosts assembled at runtime via split-string arrays joined with.join("") — resolving to oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, and oob-worker.cf100-416.workers.dev — with a DNS-TXT fallback channel over *.dl.wel1.ru. The downloaded bytes are written to /var/tmp or %TEMP% under decoy names (dotnet_diag_*.exe,.cache_*), chmodded 0755, and executed detached via spawn('/bin/sh', ['-c', fp+' &']) or spawn('cmd.exe', ['/c', 'start', '/b', fp]). A lock file at /tmp/.analytics_state (or the Windows TEMP equivalent) enforces a ~6h TTL so the drop runs at most once per window, and start() short-circuits when DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, or DO_NOT_TRACK is set. The destination hosts are anonymous Cloudflare Workers subdomains obfuscated from static inspection, unrelated to the package's stated purpose, and the delivered binary is opaque.

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-2026-12830?

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-2026-12830 is a malicious package: bigops-activity-headers-interceptor (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-2026-12830/ (Markdown: https://insights.sbomify.com/MAL-2026-12830/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12830

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-12830/
Summaries are generated and may contain mistakes; the official description above is the record.