alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BF Botnet CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"?ver="; content:"&os="; distance:0; content:"&binary="; distance:0; content:"&token="; distance:0; content:"&run_time="; distance:0; fast_pattern; http.header; content:"Pragma|3a 20 20|"; content:"Cache-Control|3a 20 20|"; reference:md5,3c475b319959069053191e740822fcd6; classtype:trojan-activity; sid:2030207; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2020_05_22, deployment Perimeter, malware_family BFBotnet, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_05_22;)