menu-filter-widget-webnpm
Advisory published Updated
menu-filter-widget-web is a confirmed malicious npm package (MAL-2026-5486) that executes malicious code on install (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in menu-filter-widget-web (npm)
What this malware does
package.json declares a postinstall lifecycle hook that runs callback.js on every npm install. callback.js reads os.hostname() and sends it to a hardcoded oastify.com (Burp Collaborator) URL via HTTPS GET, with a fallback DNS lookup that embeds the hostname as a subdomain label. Both channels carry a unique token plus the installer's hostname, registering the install with a remote attacker-controlled collaborator on every install. The package self-describes as a 'PoC' but is published to the public registry, so any installer leaks host identity automatically without consent.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for menu-filter-widget-web (version 0.0.1).
If you installed it — respond
Remove menu-filter-widget-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.
Did it already run?
If menu-filter-widget-web 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 menu-filter-widget-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.