alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Exvicy CnC Panel Checkin"; flow:established,to_server; flowbits:set,ET.ExvicyPanel; http.method; content:"POST"; http.uri; bsize:14; content:"/panel/pb-fire"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|user-agent|0d 0a|"; reference:url,sekoia.com/blog/exvicy-a-copycat-of-the-errtraffic-malware-distribution-frameworks; reference:md5,77efad936a01ed754dcfeae281d7d521; classtype:trojan-activity; sid:2071884; rev:2; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_01, deployment Perimeter, deployment SSLDecrypt, malware_family exvicy, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_09_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)