vs-modulesnpm
Advisory published Updated
vs-modules is a confirmed malicious npm package (MAL-2026-15564) that executes malicious code on install (malicious versions 1.2.1, 1.2.2). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in vs-modules (npm)
What this malware does
package.json declares a preinstall hook that runs node resources.js, which fires automatically on npm install. resources.js is heavily obfuscated with an obfuscator.io-style string-array plus numeric-index dispatch that hides the URL, destination path, and exec call. Deobfuscation shows the script reconstructs the plain-HTTP URL http://whaomydaddy.bts-the-time-in-shanghai.netlify.app/hey.bat, downloads it into %TEMP% via curl -L -o <dest> <url>, and immediately runs the batch file via child_process.exec. The destination is an anonymous netlify subdomain over plain HTTP with no pinning or integrity check, so any content served at that URL executes on the installer's host at install time. The package's stated purpose (a kanban/utility module) is unrelated to fetching and executing a Windows batch file from an external host.
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
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for vs-modules (2 malicious versions).
If you installed it — respond
Remove vs-modules 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.
Did it already run?
If vs-modules 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
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks vs-modules-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.