The @years19/n8n-nodes-utils-helper-l npm package version 1.0.0 includes a postinstall script and main entrypoint (index.js) that fetch four tarballs from a remote server with TLS verification disabled. These tarballs contain tools such as mhddos, PyRoxy, impacket, and multidict, which are extracted into /tmp and the user's Python site-packages. The package then spawns background Python 3 processes that conduct UDP/TCP/GET flood attacks against IP 103.118.252.21. Additionally, it collects the output of system commands 'id' and 'hostname', base64-encodes this data, and sends it via HTTPS GET to a remote URL with a command parameter, enabling remote command and control. The malicious payload activates both during npm install and whenever the package is imported or required.

This malicious package can compromise the host system by executing unauthorized network flood attacks, potentially implicating the user in denial-of-service activities. It also leaks system information to an attacker-controlled server and establishes a remote command channel, which could lead to further compromise or control of the affected system.

No official patch or remediation is currently available for this package. Users should immediately remove the @years19/n8n-nodes-utils-helper-l package version 1.0.0 from their environments and avoid installing or importing it. Verify the integrity and source of npm packages before installation. Monitor for any unexpected network activity or background Python processes spawned by npm packages. Check vendor advisories or npm security advisories for updates or removal notices regarding this package.