The npm package @years19/n8n-nodes-utils-helper-l version 1.0.0 contains malicious code that executes during installation and runtime. It downloads multiple tarballs containing attack tools, disables TLS verification, extracts files into system directories, and launches background Python processes to perform network flood attacks. It also collects system information and sends it to a remote server via HTTPS GET requests. This behavior poses a risk of unauthorized remote command execution and participation in denial-of-service attacks.