Troj/Nonaco-Gen is a family of Trojans for the Windows platform.
Members of Troj/Nonaco-Gen typically copy themselves to the Windows or Temp folder, and set a registry entry at the following location to run themselves at startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Members of Troj/Nonaco-Gen include functionality to contact and download from remote websites, and to set further registry entries.