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Malicious package

tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestmentsnpm

tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments is a confirmed malicious npm package (MAL-2026-12267) that steals credentials and exfiltrates sensitive data (malicious version 20.8.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments (npm)

MAL-2026-12267
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments

What this malware does

On require() of the package's main index.js, loader.js selects a platform-specific endpoint and fetches an opaque native binary over HTTPS from a rotating list of *.workers.dev hosts whose hostnames are assembled at runtime via string-split concatenation (e.g. ["oob-worker.cf1","01-adf.workers",".d","ev"].join("")). The fetched bytes are written to /var/tmp/.cache<hex> or %TEMP%\dotnet_diag_<hex>.exe (a filename mimicking.NET diagnostics), chmod'd 0755, and spawned detached/unref'd via /bin/sh -c or cmd.exe /c start /b. If HTTPS fails, the loader falls back to DNS TXT queries against c.<domain> and numbered chunks under *.dl.well1.site zones (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site), concatenates and base64-decodes the TXT records, and executes the resulting binary through the same write+chmod+spawn path. The file uses variable names such as analytics_state, telemetry, and a DISABLE_TELEMETRY env var, and lib/telemetry.js is a sibling with an equivalent chunked base64 write+chmod+spawn pathway. The package presents itself as an "arrestments provider" for an internal typed client and has no legitimate reason to fetch and execute anonymous binaries. No pinning, no hash verification, no publisher-controlled destination.

Malicious versions

1 flagged
20.8.3

Indicators of compromise (SHA-256)

86cb27375f9846c6aeba581e7e7ec6112eefd54f8d743638a1e803bde3d46616

Detection & response playbook

Credential / info stealer
  1. Find it

    Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments (version 20.8.3). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments across your stack and pipelines.

  2. If you installed it — respond

    tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

  4. How O3 protects you

    O3 blocks tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments on npm has been identified as a malicious package (version 20.8.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-014509

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Explore

tinkoff-statist-browser-typed-client-mb.product.restrictions.arrestments (npm) malicious package — MAL-2026-12267 | O3 Security