alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Trenda Router AC11 RCE Inbound (CVE-2021-31755)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/goform/setmac"; fast_pattern; http.request_body; content:"&mac="; reference:url,www.fortinet.com/blog/threat-research/the-ghosts-of-mirai; reference:url,github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-31755.yaml; reference:cve,2021-31755; classtype:attempted-admin; sid:2033284; rev:4; metadata:attack_target Networking_Equipment, tls_state plaintext, created_at 2021_07_08, cve CVE_2021_31755, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_10_21, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)