http://www.emsisoft.com/en/malware/?Adware.NewDotNet said:new.net is an ad supported software. The application is running silently in the background as a browser helper object (BHO). It pops up ad windows while you are surfing the web and periodically connects to the remote server to check for available updates.
new.net was originally designed to shorten web addresses. They created some new virtual top level domains like .mp3, .xxx, .travel which can only be visited on computers with the new.net addons installed.
The software is mostly bundled with other software products like file sharing tools or other ad supported freeware tools