|Unfortunatly there are many many programs that use this backdoor|
I believe that MalwareBytes will eliminate it. I recommend running windows in safemode with networking or doing a system restore to a previous point.
This malware is often dropped through removable drives so I would scan those as well.
Which process are you killing just Isass.exe?
there may be more as well. IF you want to paste the list of processes running I will look to see what else might be on there.