alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DCRat Initial CnC Activity"; flow:established,to_server; urilen:>100; http.request_line; content:"=c|20|HTTP/1.1"; endswith; fast_pattern; http.method; content:"GET"; http.uri; content:".php?"; content:"=c"; distance:32; within:2; endswith; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; endswith; content:!"Referer"; reference:md5,4467b54917f60b657e0c92df4296cbc1; classtype:command-and-control; sid:2029881; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_13, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Major, updated_at 2020_07_07;)