Seems to be a BAckdoor. It could be this one Backdoor.Sequel . The problem is, that Avast seems to use generic Names for different Malware. If you want to get more information send that file to Avast, or try to get the real Name for that Backdoor. To get a Name you can use this Link (I hope i do not get in trouble because of this.;)) : http://www.kaspersky.com/remoteviruschk.html

Maybe Avast is able to automaticly get rid of Backdoors with the new Major update announced here in the Forum.