MAL-2026-13865 Malicious code in @years18/n8n-nodes-utils-helper-u (npm)

The package's postinstall script (duplicated as the main module) runs unconditionally on npm install. It executes id and hostname, base64-encodes the output, and transmits it as a query-string parameter to a hardcoded HTTPS endpoint at jasabersama.id/portfolio-data.php with TLS certificate validation explicitly disabled (rejectUnauthorized: false). The same lifecycle hook installs the Python impacket package system-wide via pip --break-system-packages and invokes /tmp/mhddos/start.py, an MHDDoS attack launcher, weaponizing the installer host for outbound denial-of-service activity. The URL also carries a c= parameter conveying a shell command that decodes attacker-controlled bytes into /tmp/n8n_rce_result.txt, providing a command-staging channel back to the same remote endpoint.