I'm 100% sure that was a virus.
Download Malwarebytes' AntiMalware.
|MG| Malwarebytes Anti-Malware 1.51.2.1300 Download
After you installed it, perform a full scan. After that, click Show Results and check everything and Remove.
Check this thread for better step by step guide.
https://www.mpgh.net/forum/166-anti-m...ng-viruss.html
If you still have the virus, just reply back.