# MAL-2026-12277: Malicious code in tinkoff-statist-browser-typed-client-sme.users.origination.web (npm)


- **Type:** Malicious package
- **Package:** `tinkoff-statist-browser-typed-client-sme.users.origination.web` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-9cfm-grjr-hpqf

## What is MAL-2026-12277?

MAL-2026-12277 is a malicious package in tinkoff-statist-browser-typed-client-sme.users.origination.web, published on 5 Aug 2026. 

### Official description

The package's main entry require()'s _loader.js, which at import time downloads a per-platform binary from string-concatenation-obfuscated Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS-TXT chunk-reassembly fallback over subdomains of dl.well1.site. The fetched bytes are written to a disguised path under /var/tmp or %TEMP% (e.g..cache_<hex> or dotnet_diag_<hex>.exe), chmod'd to 0755 via bracketed property access (fs["chmod"+"Sync"]), and executed detached via cp.spawn("/bin/sh", ["-c", path + " &"]) or cp.spawn("cmd.exe", ["/c", "start", "/b", path]). API names and hostnames are hidden behind array-join concatenation (require("child_"+"process"), ["oob-worker",".cf103-070.w","orkers.dev"].join("")) to evade static detection. A second copy of the dropper is shipped in lib/telemetry.js under an "Analytics SDK" cover story, using the same primitives (base64-chunk Buffer assembly, disk write, chmod 0755, /bin/sh spawn). The fetched payload is opaque, unpinned, unverified, and delivered from non-publisher-controlled infrastructure with a covert DNS channel; the destinations do not match the package's declared scope (a Tinkoff-branded internal typed client).

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-2026-12277?

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-2026-12277 is a malicious package: tinkoff-statist-browser-typed-client-sme.users.origination.web (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-2026-12277/ (Markdown: https://insights.sbomify.com/MAL-2026-12277/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12277

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12277/
Summaries are generated and may contain mistakes; the official description above is the record.