# MAL-2026-13228: Malicious code in bigops-offers (npm)


- **Type:** Malicious package
- **Package:** `bigops-offers` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-13228?

MAL-2026-13228 is a malicious package in bigops-offers, published on 5 Aug 2026. 

### Official description

bigops-offers@35.6.8 executes a binary dropper at require time. index.js loads./_init on import; _init.js assembles C2 hostnames from split string arrays (workers.dev subdomains oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev) and fetches a platform-specific binary via https.get. A DNS TXT-record fallback assembles base64 payload chunks from c.dl.wel1.ru and 0..N.dl.wel1.ru (sdk/ext/pkg/net subdomains). The retrieved bytes are written to a disguised path (dotnet_diag_<rand>.exe on Windows,.cache_<rand> on Unix), chmod 0o755, and spawned detached via /bin/sh or cmd. A.analytics_state lock file and DISABLE_TELEMETRY/DO_NOT_TRACK env checks provide a telemetry cover story. Destinations, filenames, and delivery channels are string-split to evade static detection.

## What should I do about MAL-2026-13228?

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-2026-13228 is a malicious package: bigops-offers (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-2026-13228/ (Markdown: https://insights.sbomify.com/MAL-2026-13228/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13228

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13228/
Summaries are generated and may contain mistakes; the official description above is the record.