alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE EVILNUM CnC Host Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/register.php"; http.request_body; content:"av="; depth:3; content:"&cpu-name="; fast_pattern; distance:0; content:"&ref="; distance:0; content:"&user="; distance:0; reference:url,blog.prevailion.com/2020/05/phantom-in-command-shell5.html; classtype:command-and-control; sid:2030125; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_07, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_17;)