PC Tools ThreatFire 4.10.1.14
"ThreatFire Free Edition is an application designed to protect your computer against malware such as trojans, spyware, rootkits, keyloggers, and buffer overflows by intelligently detecting and blocking behavior consistent with that of malware.
ThreatFire uses advanced patent-pending technology to detect signs of malicious behavior commonly used by malware threats. ThreatFire is unlike traditional antivirus products that rely on old fashioned "signature" technology and require updating every time a new threat occurs. "