alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE EVILNUM CnC Connectivity Check"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/tran/check.php?id=&ver="; startswith; fast_pattern; pcre:"/&ver=\d\.\d$/i"; http.accept; content:"text/html, application/xhtml+xml, */*"; startswith; endswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,blog.prevailion.com/2020/05/phantom-in-command-shell5.html; classtype:command-and-control; sid:2030124; rev:4; 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 2024_04_30;)