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MAL-2026-12046

Malicious code in statist-browser-typed-client-test.jumpwork.circuitbreaker (npm)

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## Source: amazon-inspector (6d969f292b82b34df445017d86910903f577428c88bd312736ef2c03f9381e4f) On require() of the package's main entry, `_compat.js` runs as a side effect: it selects a per-platform payload, fetches a native binary over HTTPS from one of several Cloudflare Workers hosts whose names are reconstructed at runtime by joining small string fragments (e.g. `oob-worker.cf102-baf.workers.dev`, `oob-worker.cf103-070.workers.dev`, `oob-worker.cf100-416.workers.dev`), writes it to `/tmp/.cache_<hex>` on Unix or `%TEMP%\dotnet_diag_<hex>.exe` on Windows, chmods it 0755, and spawns it detached via `/bin/sh -c "<file> &"` or `cmd /c start /b`. A DNS-TXT covert channel provides a fallback delivery path against `*.dl.well1.site` (tin/tina/ldr/win subdomains), retrieving a count record at `c.<domain>` and then base64-encoded chunks from `<i>.<domain>` that are concatenated and executed. A second, larger duplicate of the same dropper (dynamic `child_"+"process` require, chmod-plus-detached-spawn, DNS discovery, base64 buffer assembly) is shipped as `lib/telemetry.js` in the tarball. Hostname string-array obfuscation and decoy filenames (dotfile cache, `dotnet_diag_*.exe`) indicate intentional evasion; installing or importing this package executes attacker-controlled native code on the developer's machine.

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npm / statist-browser-typed-client-test.jumpwork.circuitbreaker

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