Troj/Dloader-NA is a Windows downloader Trojan which, when run, attempts to download files from a remote website and run them.
Once run the Trojan copies itself to the Windows System folder as wintask.exe and creates the following registry entry so as to run itself on user logon:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
WinTask driver
%SYSTEM%\wintask.exe