alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Naoinstalad Checkin"; flow:to_server,established; http.method; content:"GET"; http.uri; content:".php?MD="; fast_pattern; content:"Naoinstalado"; nocase; http.user_agent; content:!"Mozilla"; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:md5,f136f9ec7f7f8cb1a12a9b835183be59; reference:url,www.malware-traffic-analysis.net/2017/06/08/index.html; classtype:command-and-control; sid:2024427; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_26, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_08_06;)