alert tcp any any -> any 8291 (msg:"ATTACK [PTsecurity] MikroTik Firewall & NAT Bypass (CVE-2019-3924)"; flow:established, no_stream, to_server; content:"|01 00|"; depth:4; content:"M2"; depth:8; content:"|68 00 00 00|"; isdataat:!1, relative; content:"|07 00 FF 09 01|"; content:"|03 00 00 08|"; content:"|04 00 00 09|"; content:"|07 00 00 21|"; content:"|08 00 00 21|"; reference:cve, 2019-3924; reference:url, www.tenable.com/security/research/tra-2019-07; reference:url, github.com/tenable/routeros/blob/master/poc/cve_2019_3924; classtype:attempted-admin; reference:url, github.com/ptresearch/AttackDetection; sid:10004547; rev:1;)