The "Ultimate Nginx Bad Bot" blocker, handles also user-agent, spam referrer,
adware, malware, ransomware, clickjacking, click directing, SEO companies
bad IPs, Wordpress theme detectors and fake Googlebots. It includes an
anti DDoS system and nginx rate limiting.

WWW: https://github.com/mitchellkrogza/nginx-ultimate-bad-bot-blocker/