Real-time detection for S3 bucket with Amazon GuardDuty > Malware protection for S3 > Enable Malware Protection

Enable Malware Protection

Now let wrap it all, back to GuardDuty Console, you will enable Malware Protection.

Reload, and select role-guardduty-s3-raw that we have created in 3.3 section
Completely enable Malware Protection for s3-raw-gd