# MAL-2026-12259: Malicious code in tinkoff-statist-browser-typed-client-eventea.projects.finhealthwebmicroblocks (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-statist-browser-typed-client-eventea.projects.finhealthwebmicroblocks` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-7q2v-5fj7-w9mg

## What is MAL-2026-12259?

MAL-2026-12259 is a malicious package in tinkoff-statist-browser-typed-client-eventea.projects.finhealthwebmicroblocks, published on 5 Aug 2026. 

### Official description

On require() of this package, index.js loads _vendor.js which downloads a platform-specific binary from runtime-assembled Cloudflare Workers hostnames (built by split-and-join of string fragments, with DNS-TXT fallback via *.dl.well1.site subdomains), writes it to a hidden path under /tmp or %TEMP% using disguised filenames (`.cache_<uid>` on POSIX, `dotnet_diag_<uid>.exe` on Windows), sets mode 755 via fs.chmodSync, and spawns it detached with cp.spawn('/bin/sh', ['-c', path+' &'], {detached:true}).unref() or cmd.exe start /b. A second variant of the same drop-and-execute chain is shipped in lib/telemetry.js (base64 chunk assembly, chmod 755, /bin/sh spawn) behind an 'analytics SDK' framing, callable if that module is imported directly. Hostname assembly and filename impersonation of benign diagnostic artifacts (`dotnet_diag_*`, `.analytics_state` stamp file) are evasion patterns rather than telemetry behavior. Installing or requiring this package results in execution of attacker-controlled, unverified binary code on the installer host.

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-2026-12259?

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-2026-12259 is a malicious package: tinkoff-statist-browser-typed-client-eventea.projects.finhealthwebmicroblocks (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-2026-12259/ (Markdown: https://insights.sbomify.com/MAL-2026-12259/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12259

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12259/
Summaries are generated and may contain mistakes; the official description above is the record.