The best "Havij killer" is not a better firewall or an antivirus. It is the knowledge and discipline of writing secure code. Understand the tool, learn from its techniques, and build stronger defenses.
Havij is a widely known automated SQL injection (SQLi) tool originally developed to assist security testers in identifying and exploiting SQL injection vulnerabilities in web applications. Version 1.19 is one of the mature releases often referenced in public writeups and malware analyses. Havij automates injection discovery, fingerprinting of database backends, extraction of data, and some post-exploitation actions. Because of its automation and GUI, it has been popular with both security professionals and attackers; defenders should be aware of its capabilities, indicators of use, and mitigations. Havij - Advanced SQL Injection 1.19