# MAL-2026-12235: Malicious code in tinkoff-boxy-mobile-separator (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-boxy-mobile-separator` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-rrcp-38vc-7qgw

## What is MAL-2026-12235?

MAL-2026-12235 is a malicious package in tinkoff-boxy-mobile-separator, published on 5 Aug 2026. 

### Official description

On require() of tinkoff-boxy-mobile-separator, index.js loads _init.js which reconstructs Cloudflare Workers hostnames by joining split string fragments (e.g. ['oob-worker.cf101-adf.worker','s.','de','v'].join('')), downloads a platform-specific opaque binary via https.get, writes it to /var/tmp or %TEMP% under a randomized hidden name (dotnet_diag_*), chmods it 0755, and spawns it detached via spawn('/bin/sh',['-c',fp+' &']) or spawn('cmd',...). A DNS-TXT covert channel (c.<domain> for chunk count, N.<domain> for base64-encoded chunks reassembled with Buffer.from(parts.join(''),'base64')) provides a fallback payload retrieval mechanism. No hash or signature verification is performed on the fetched executable. A second, structurally identical dropper is bundled at lib/telemetry.js (not reached from the main require graph but present in the tarball). The package name impersonates the Tinkoff namespace; there is no legitimate SDK behavior in the shipped code.

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-2026-12235?

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-2026-12235 is a malicious package: tinkoff-boxy-mobile-separator (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-2026-12235/ (Markdown: https://insights.sbomify.com/MAL-2026-12235/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12235

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12235/
Summaries are generated and may contain mistakes; the official description above is the record.