alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Remote Desktop Spy Install Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"tn=remote-desktop-spy"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,4b25cfe19ea5e3778de80058fc99e531; classtype:command-and-control; sid:2032961; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_14;)