@klapp-about/routesnpm
Advisory published Updated
@klapp-about/routes is a confirmed malicious npm package (MAL-2026-5411) that executes malicious code on install (malicious versions 99.0.0, 99.0.1, 99.0.2). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @klapp-about/routes (npm)
What this malware does
On npm install, the package's preinstall hook (node index.js) collects host and user identity data — os.hostname(), os.userInfo().username, __dirname, process.cwd(), pid, node version, platform, and architecture — and ships them to two attacker-controlled destinations: (a) an HTTP POST to a bare IP http://172.201.213.59:9090/cb/klapp-about-routes carrying the collected fields as JSON, and (b) a hex-encoded DNS lookup to *.d8jbmnsqcfu78dfs8vdg34ohqhirb4pbg.oast.live (interactsh out-of-band callback). The package name @klapp-about/routes and the unusually high version 99.0.0 are the canonical shape of a dependency-confusion attack — an internal-looking scope published to public npm at a version high enough to override a private resolver. Self-description as a 'security research / dependency-confusion PoC' does not change installer-side impact: any developer or CI system that misroutes installs to the public registry has their machine fingerprint shipped to the hardcoded IP and DNS callback service without consent.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for @klapp-about/routes (3 malicious versions).
If you installed it — respond
Remove @klapp-about/routes 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 @klapp-about/routes 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 @klapp-about/routes-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.