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YARA is a tool used to help researchers to identify and classify malware. Yara is a multi-platform that supports both Unix and Windows based systems. It can be used via command line or from python scripts with the yara-python extension. YARA version 3.0 or higher is required in order for the rules to work. It is beneficial for reverse engineering or incident response and is typically used by malware forensic analysts, incident responders, and threat hunters. The rule identifier can start with an alphanumeric letter or an underscore but cannot start with a digit.