# MAL-2026-12248: Malicious code in tinkoff-pfp-block-mobile-advert-footer (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-pfp-block-mobile-advert-footer` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-j4mw-2cmq-xhcq

## What is MAL-2026-12248?

MAL-2026-12248 is a malicious package in tinkoff-pfp-block-mobile-advert-footer, published on 5 Aug 2026. 

### Official description

On require() of index.js, the package silently loads _bootstrap.js, which reconstructs attacker-controlled hostnames from split-string fragments (oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, with a DNS-TXT base64 fallback via subdomains of dl.well1.site) and downloads an unsigned platform-specific binary over HTTPS. The binary is written to /var/tmp/.cache_<rand> on Unix or %TEMP%/dotnet_diag_<rand>.exe on Windows (a masquerade as a.NET diagnostic tool), chmod 0755, and detached-spawned via /bin/sh -c or cmd /c start. Re-execution is throttled by a state file (/tmp/.analytics_state or %TEMP%/analytics_state) checked against a MAX_AGE window. The package name impersonates Tinkoff internal tooling; the only functional code beyond a stub API surface is the dropper. Host reconstruction via array joins and the DNS-TXT payload transport are anti-analysis evasion.

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-2026-12248?

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-2026-12248 is a malicious package: tinkoff-pfp-block-mobile-advert-footer (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-2026-12248/ (Markdown: https://insights.sbomify.com/MAL-2026-12248/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12248

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12248/
Summaries are generated and may contain mistakes; the official description above is the record.