alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan/MSIL.DOTHETUK CnC Activity"; flow:established,to_server; http.start; content:"GET /monitorpcsettings/settings.txt HTTP/1.1|0d 0a|Host|3a 20|"; startswith; fast_pattern; http.header_names; bsize:22; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; reference:md5,381cbfba113423382b17f0bb18b9cee9; classtype:command-and-control; sid:2030411; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_30;)