alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/BlackNET CnC Keep-Alive"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?command="; content:"&vicID="; distance:0; fast_pattern; http.header_names; content:!"Referer"; reference:md5,16b2192fc64d1cc4347cc505234efbb7; classtype:command-and-control; sid:2029179; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_17, deployment Perimeter, malware_family BlackNET, confidence High, signature_severity Major, updated_at 2019_12_27;)