The main use of YARA, and the one it was initially created for in 2008, is to detect malware. You need to understand it does not work as a traditional antivirus software. While the latter mostly detects static signatures of a few bytes in binary files or suspicious file behavior, YARA can enlarge detection by using specific components combinations. Therefore, it is possible to create YARA rules to detect whole families of malware and not just a single variant. The ability to use logical conditions to match a rule makes it a very flexible tool for detecting malicious files.
Link: Cybersecurity: Increase your protection by using the open-source tool YARA
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