That ain't a virus,it's a keylogger,and when it tries to inject into SA,the antivirus reports it as an Invader.Mostly this comes from:Avast!,AVG,NOD 32,Eset Smart Security,ZoneAlarm.
If your AV has an exception list,add the trainer there.It's not a virus.I repeat,it's not a virus.
Kaspersky is the best BTW.