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.
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