This limitation in detecting new, customized or targeted malware may be changing though, as antimalware software...
is including more behavioral-detection capabilities in its core functionality. Antimalware has included heuristic functionality for many years, but the recent advancements in behavioral detections are a significant improvement over heuristic detection. The behavioral detections can be more generic than traditional signatures because the antimalware software can find malicious behavior -- such as programs accessing saved passwords or sending passwords to an external website -- and then potentially block it or detect as malicious the file(s) being used by the malware to access passwords and quarantine them.
Dig Deeper on Malware, virus, Trojan and spyware protection and removal
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