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Malicious package

tesgfvbncsdbcvnpm

Advisory published Updated

tesgfvbncsdbcv is a confirmed malicious npm package (MAL-2026-15618) that typosquats a legitimate package to trick installs (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tesgfvbncsdbcv (npm)

MAL-2026-15618
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall tesgfvbncsdbcv

What this malware does

Published as part of a ClickFix-style fake-CAPTCHA phishing campaign documented by OX Security (see reference). The package's only file is index.html, declared as the npm "main" entry; package.json defines no preinstall/install/postinstall/prepare lifecycle script, so the payload does not execute at npm install time. index.html renders a fake Cloudflare Turnstile verification widget. An obfuscator.io-obfuscated inline script builds a hardcoded redirect URL to https://login.microsofte.live/ (a typosquat of a Microsoft sign-in domain), appends the visitor's original query-string parameters, and navigates the browser there via window.location.replace(). The package therefore does not attack the installing machine directly; it is used as a static file host on the npm CDN (e.g. unpkg/jsDelivr) so the index.html can be linked to and opened directly in a victim's browser as a phishing/ClickFix landing page. Published by npm user "johnvaldez9a" as part of a burst of near-identical single-purpose packages published between 2026-08-04 and 2026-08-24 that share this same fake-Turnstile-redirect page structure.

The package was found to contain malicious code or consuming dependency that contains malicious code

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.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

f5fffcb742865a5c2de2d78ce95c8b93607ec879502ffd8e3081467b3b083fb5
edc70816114c9b7bd015836a73966a0c9064a3151ce9d58696990eb9e80e492c

Detection & response playbook

Typosquat
  1. Find it

    Search your lockfiles and build artifacts for tesgfvbncsdbcv (version 1.0.0).

  2. If you installed it — respond

    tesgfvbncsdbcv is a typosquat — you almost certainly intended a legitimately-named package. Remove tesgfvbncsdbcv, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

  3. Did it already run?

    If tesgfvbncsdbcv was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. tesgfvbncsdbcv on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-019211GHSA-g964-6ghm-6425

References

Credits

  • Amazon Inspector · finder
  • OX Security · finder

Detect & block this

O3 blocks tesgfvbncsdbcv-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.

Explore

tesgfvbncsdbcv (npm) malicious package — MAL-2026-15618 | O3 Security