![]() Signature-based detection tries to find specific viruses that have already been caught and analysed. So don's get overenthusiastic with high settings. ![]() Though with more aggressive detection comes more false positives. Many others may do as well (check AVG, Avast, Avira, etc) though I am not sure about them. Among free antiviruses i know COMODO Antivirus provides this type of protection (its called HIPS in it). This is just one example, the behaviour-based security could monitor hundreds of potential harmful activities. So monitoring autorun is a good way to catch a virus and is unlikely to bother you with false positives. ![]() Usually applications add themselves to autorun during installation or when you deliberately ask them to do so. No matter how new the virus is it needs to autorun somehow every time when computer starts. Just like firewall can detect suspicious network activity modern antiviruses can monitor suspicious activity within your system. ![]() Though there are some measures that can make it less likely: There is no perfect security and noone can guarantee that a virus will never go through whatever defence you set up. ![]()
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