said by Jrb2:
May I ask whether you remember which other scanners (be it on-line or off-line; be it cloud-based or not) or any other tools you may have used? Any more info that you may have, could help others and also the AV/AT/AS companies when there is a new variant. The more info, the better
I tried Malwarebytes, both anti-malware and anti-rootkit versions (which were pre-installed and active), SpyBot, Spy Hunter and CCleaner. As I said earlier, there are numerous web references to manually removing this intruder on various browsers, but none of that now works because it doesn't show in add-ons for any browser I have installed, nor does it show as a removable item in Windows7. I found about 30+/- registry entries and removed all manually, but that didn't help. I was fortunate to have a recent (3 days) restore point and that resolved the problem.