Trojan.Dronjaga is a Trojan that downloads potentially harmful files on to the infected computer. This Trojan does allow the infected computer to restart.

This Trojan copies itself as
%System%\userinit.exe

And the original version of ‘userinit.exe’ is copied as the following file:
%System%\userini.exe

Systems Affected: All Windows.

To remove Trojan.Dronjaga follow this procedure

1. Disable System Restore (Windows Me/XP) [+].

2. Update computer anti virus software with latest virus definitions.

3. Backup system registry[+].

4. Restart your system in safe-mode.[+]

5. Run a full system virus scan using your updated anti virus program.


Source: Symantec