auditd
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monitor execveat syscall which can be use for file less malwares
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check this https://github.com/vahidmalekk/bypass-Neo23x0-auditd-config/
-a always,exit -F arch=b64 -F auid>=1000 -F auid!=-1 -S execveat -k Memory-Process-creation -a always,exit -F arch=b64 -F auid>=1000 -F auid!=-1 -S execveat -k Memory-Process-creation