In the early days of viruses and other computer malware, antivirus utilities relied on ever-growing signature databases to identify dangerous files. Polymorphic malware foiled signatures, so security companies devised heuristic and behavior-based detection methods. This proliferation of techniques sometimes created very large programs. Rather than expand to catch every new attack instantly, Webroot SecureAnywhere AntiVirus keeps watch on unknown programs until its brain in the cloud comes to a judgment. If it’s thumbs down, the tiny local program wipes out the attacker and reverses its actions. It’s a very unusual system, but testing proves that it does the job, and does it well.