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 Security WinSonar - protection against unknown programs
I first ran into this program a few years ago. Since then, Zancart has included more features and made it easier to use. WinSonar might satisfy even the most paranoid people when it comes to it's protection system. When you first start WinSonar it will offer to scan all your TCP ports and report any that are open. Open ports may indicate the presence of a Trojan or Spyware application running. While WinSonar is running it constantly monitors your PC for running processes that it doesn't recognize. This will help you take control of you PC and prevent unknown programs from taking control away from you. When it finds processes it doesn't know, it will allow you to choose whether the process is safe or needs to be eliminated. WinSonar installs easily and doesn't seem to be a system resource hog.
Website - Download - Freeware
Quote from the website - Winsonar 2005 XP Freeware Edition is a program specifically designed for process monitoring and system protection from unknown processes: the program detects new processes permanently installed into memory while system is working off-line, offering also an active Internet protection, by optional automatic termination of any unknown process trying to load itself into memory when the system is on line.
The basic idea is that if the user could know a new program silently installed into memory when off-line, he could take appropriate countermeasures. Unfortunately this does not offer any protection against downloading a malware when the system is on-line. For this reason the program detects the on-line status, asking then the user if an automatic termination of any unknown processes is desired (this option can be also enabled by default).
This leads to an active protection against trojan\spyware-infected e-mail attachments: even if the user unfortunately opens the attachment, the malicious executable process will be suddenly terminated, without having the time to perform any action.
 Clif Notes Freeware and Website Reviews