Uh, if it is this one: http://securityresponse.symantec.com/avcenter/venc/data/backdoor.nettrojan.html read the description carefully. Removing is a bit tricky for this one.
You can get some more infos here: http://www.virusbtn.com/resources/vgrep/vgrep.cgi?terms=BackDoor-ANF&product=0