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Malicious package

statist-browser-typed-client-ddp.mentat.ui.webnpm

statist-browser-typed-client-ddp.mentat.ui.web is a confirmed malicious npm package (MAL-2026-12209) that executes malicious code on install (malicious version 20.9.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in statist-browser-typed-client-ddp.mentat.ui.web (npm)

MAL-2026-12209
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall statist-browser-typed-client-ddp.mentat.ui.web

What this malware does

The package's main entry (index.js) loads _polyfill.js, which on module load detects OS and architecture, fetches a per-platform binary over HTTPS from one of four obfuscated destinations whose hostnames are assembled at runtime via string-fragment .join("") calls (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes the payload to /tmp or the Windows TEMP directory under disguised names such as dotnet_diag_<hex>.exe or .cache_<hex>, chmods it to 0755, and spawns it detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}).unref(). A DNS-based fallback channel reconstructs the payload by concatenating base64-encoded TXT records under numbered subdomains of dl.well1.site (tin, tina, ldr, win). A second parallel dropper implementation ships in lib/telemetry.js under an "analytics SDK" cover story, using require("child_"+"process") and fs["chmod"+"Sync"] string-splits to evade scanners. Any consumer that requires this package triggers download and detached execution of an opaque attacker-controlled native binary on the host.

Malicious versions

1 flagged
20.9.4

Indicators of compromise (SHA-256)

0dc78a545236395c12156cd5f8e36337df53024afd0a6a6da75f81fb9b7c11e7

Detection & response playbook

Malicious package
  1. Find it

    Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for statist-browser-typed-client-ddp.mentat.ui.web (version 20.9.4). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging statist-browser-typed-client-ddp.mentat.ui.web across your stack and pipelines.

  2. If you installed it — respond

    Remove statist-browser-typed-client-ddp.mentat.ui.web from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If statist-browser-typed-client-ddp.mentat.ui.web 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 statist-browser-typed-client-ddp.mentat.ui.web 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. statist-browser-typed-client-ddp.mentat.ui.web on npm has been identified as a malicious package (version 20.9.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-014618

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks statist-browser-typed-client-ddp.mentat.ui.web-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

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