Fr-cus8.s3.amazonaws.com is a malicious domain that attacks computers located in France and possibly in some other neighboring countries. Even Canada may be under the attack. These pop-ups have in mind to scare computer owners into wasting their money by forcing to call +32 13 48 02 69 toll-free helpline that is run and controlled by cyber frauds. They will tell you that the system is deeply infected with malware that that you need to pay money in their favor for fixing it. Use this guide that will help you to fix your computer in a proper way and to remove adware that causes these nasty pop-ups in your screen.