test1sdsd2npm
Advisory published Updated
test1sdsd2 is a confirmed malicious npm package (MAL-2026-16316) that opens a backdoor for remote access (malicious version 99.99.99). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in test1sdsd2 (npm)
What this malware does
Package [email protected] declares preinstall and postinstall hooks in package.json that execute index.js on npm install. index.js performs an HTTP GET to the hardcoded bare IP http://128.199.122.145/?test1sdsd2, embedding the package name in the query string, which confirms code execution on the installer's machine and leaks install-signal (package name, implicit source IP, timing) to an attacker-controlled endpoint. The version number 99.99.99 combined with the beacon shape is the canonical dependency-confusion probe pattern used to detect resolution of an internal package name against a public registry. The package ships no legitimate library functionality.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Search your lockfiles and build artifacts for test1sdsd2 (version 99.99.99).
If you installed it — respond
test1sdsd2 establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If test1sdsd2 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 test1sdsd2-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.