Malware attacks by external agents pose a continuing threat to government and commerce; information security costs are significant, and rising. CodeDNA is a scalable, shareable technology that facilitates community-based defense against malware attacks. CodeDNA has a significantly higher malware variant detection accuracy compared to other industry benchmarks. Attackers generally base new attacks on previously developed code; CodeDNA exploits this efficiency by reporting the codebase relationships between malware binaries. CodeDNA detects families of attacks and supports a navigable means of exploring attack family development, leading to rich insights and useful predictions about what a broad range of future zero-day attacks may look like, so that the defenders can detect them instantly.