# MAL-2026-12270: Malicious code in tinkoff-statist-browser-typed-client-sme.platform.mobile.dynamicteasers.common (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-statist-browser-typed-client-sme.platform.mobile.dynamicteasers.common` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-6w5q-p9g3-26hf

## What is MAL-2026-12270?

MAL-2026-12270 is a malicious package in tinkoff-statist-browser-typed-client-sme.platform.mobile.dynamicteasers.common, published on 5 Aug 2026. 

### Official description

On require/import, index.js loads _bridge.js which selects a platform-specific endpoint and downloads an opaque executable over HTTPS from hardcoded hosts assembled via string-join obfuscation (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT chunked base64 fallback via *.dl.well1.site. The downloaded bytes are written to disguised paths (/var/tmp/.cache_<hex> on Unix, %TEMP%\dotnet_diag_<hex>.exe on Windows), chmod'd 0o755, and spawned detached via /bin/sh -c or cmd /c start /b. Hostnames are reconstructed from character-fragment arrays via.join(), staging filenames masquerade as system diagnostics/cache artifacts, and DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env checks are used as cover. The package name presents as a scoped Tinkoff internal client but the shipped code performs full remote code execution on the installer's host at load 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-2026-12270?

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-2026-12270 is a malicious package: tinkoff-statist-browser-typed-client-sme.platform.mobile.dynamicteasers.common (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-2026-12270/ (Markdown: https://insights.sbomify.com/MAL-2026-12270/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12270

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12270/
Summaries are generated and may contain mistakes; the official description above is the record.