alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET DELETED Kazy/Kryptor/Cycbot Trojan Checkin 3"; flow:to_server,established; content:"GET"; nocase; http_method; content:"?pr="; fast_pattern; http_uri; content:!"Accept|3a|"; http_header; pcre:"/\.(jpg|png|gif|cgi)\?pr=/U"; classtype:trojan-activity; sid:2013866; rev:6; metadata:created_at 2011_11_08, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)