The npm package @years18/n8n-nodes-utils-helper-q version 1.0.0 contains malicious postinstall code that, upon installation, downloads and installs DDoS attack tools on the host machine. It disables TLS verification during download, installs Python dependencies with system package overrides, executes a DDoS attack script, and exfiltrates system information encoded in base64 to a remote server. The package masquerades as a benign 'Helper Utils' node for n8n to disguise its hostile behavior.