# MAL-2026-12237: Malicious code in tinkoff-codeceptjs-storyshots-alpha (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-codeceptjs-storyshots-alpha` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-fhqv-jjj8-w6wh

## What is MAL-2026-12237?

MAL-2026-12237 is a malicious package in tinkoff-codeceptjs-storyshots-alpha, published on 5 Aug 2026. 

### Official description

The package's index.js unconditionally requires _bootstrap.js on load. _bootstrap.js selects a platform-specific path (linux_x64, linux_arm64, darwin, win32), fetches an opaque binary from Cloudflare Workers hosts under oob-worker.cf10*.workers.dev whose names are reassembled at runtime via array-join to evade static inspection, and includes a DNS TXT chunked fallback channel using tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The downloaded bytes are written to /tmp or %TEMP% under disguised names such as dotnet_diag_<hex>.exe and.cache_<hex>, chmod 0755 on unix, and spawned detached via spawn("/bin/sh", ["-c", path + " &"]).unref() (spawn("cmd",...) on Windows). A marker file named.analytics_state gates repeat execution on a ~22374 second cooldown, and opt-out environment variables are honored in a way that mimics legitimate telemetry. A secondary module lib/telemetry.js contains the same dropper primitives with property-name obfuscation (fs["chmod"+"Sync"], require("child_"+"process"), Buffer.from(chunks,"base64")) alongside spawn("/bin/sh", ["-c", filePath + " &"]). The name tinkoff-codeceptjs-storyshots-alpha impersonates a well-known corporate scope; there is no legitimate reason for a storyshots testing helper to fetch and execute an opaque native binary from an anonymous Cloudflare Workers host at import time.

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-2026-12237?

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-2026-12237 is a malicious package: tinkoff-codeceptjs-storyshots-alpha (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-2026-12237/ (Markdown: https://insights.sbomify.com/MAL-2026-12237/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12237

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12237/
Summaries are generated and may contain mistakes; the official description above is the record.