MAL-2026-13873 Malicious code in @years17/n8n-nodes-utils-helper-d (npm)

On npm install, the package's postinstall hook runs node callback.js (with identical logic duplicated in index.js so it also fires on require). The script uses execSync to enumerate installer-side host data — listings of /app, /opt, /home/ubuntu, /proc/1/cmdline, /etc/hosts, internal DNS names such as nexus.local/proxy.nexus.local, and the contents of /home/ubuntu/.ssh/authorized_keys — base64-encodes the aggregated output, and transmits it via HTTPS GET to jasabersama.id/portfolio-data.php with rejectUnauthorized: false (TLS verification disabled). The request also carries a c= parameter containing a base64-decoded shell command written to /tmp/n8n_rce_result.txt, consistent with an attacker-side command-delivery handler. The package name mimics an n8n community-node utility, and the SSH trust material plus internal host discovery targeting nexus.local indicate an active reconnaissance and credential-theft campaign against installer infrastructure.