svchost.exe undectable by everything

I have a trojan virus in the svchost.exe and norton will not find it, microsoft will not find it, AVG will not find it. I've run the scans while not in safe mode and in safe mode, I've booted from a USB drive and run scans and still there is not threat found, however Malwarebytes seems to pick it up. I've already restored my computer multiple times. Now what? I'm stuck with this and I only bought Norton thinking it would be the best, however it still does not work.