Threatfire is a freeware security software for Windows that is designed to intelligently detect and remove zero-day viruses, worms, trojans, spyware, rootkits, keyloggers & buffer overflows based on their behavior rather than relying on a database of signatures which may not be up to date. It is intended as an extra layer of protection to complement your existing signature-based antivirus/antispyware product.

After detecting a threat based on behavior using the ActiveDefense technology, Threatfire enhances its analysis by checking the found threat against a known signature database. This allows it to quarantine known high-risk items immediately and offer the user a choice for known lower-risk items. For programs not found in the database, the program reports a calculated risk level, describes the behavior that caused it to raise a flag, and asks permission to quarantine the threat.

Key features of ThreatFire include:

+ Immediately Effective: ThreatFire provides immediate protection out-of-the-box. There are no configuration changes or time-consuming signature downloads to be done.
+ Proactive Defense against Both Known/Unknown Threats: ThreatFire does not rely on signatures to protect you; instead, it uses intelligent behavioral analysis to proactively hunt down and paralyze any activity or behavior that might compromise the security of a PC.
+ Rootkit Scanner Seeks Out Deeply Hidden Files, Objects and Registry Keys
+ System Performance: Even though ThreatFire runs constantly in the background while it watches for potentially malicious activity, it is very light on system resources.

Click here to download ThreatFire for Windows 2000, XP, 2003 and Vista.