@an1mshnpmb9c84920/pipeprobe-obf-m19n5npm
Advisory published Updated
@an1mshnpmb9c84920/pipeprobe-obf-m19n5 is a confirmed malicious npm package (MAL-2026-18439) that executes malicious code on install (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @an1mshnpmb9c84920/pipeprobe-obf-m19n5 (npm)
What this malware does
The package's prepare lifecycle script executes node index.js, which reconstructs the hostname npmp19n5--768.oob.awss.dev by joining a string array and issues a DNS lookup via require('dns').lookup(...). The destination is an out-of-band application-security-testing callback host carrying a unique per-package label, so installing the package confirms code execution on the installer's machine to the operator of that domain. The hostname is assembled from an array of fragments at runtime rather than appearing as a plain literal, concealing the destination from static scanners. The package provides no legitimate functionality consistent with a lifecycle-time DNS callback to an external token-bearing host.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for @an1mshnpmb9c84920/pipeprobe-obf-m19n5 (version 1.0.0).
If you installed it — respond
Remove @an1mshnpmb9c84920/pipeprobe-obf-m19n5 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 @an1mshnpmb9c84920/pipeprobe-obf-m19n5 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 @an1mshnpmb9c84920/pipeprobe-obf-m19n5-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.