alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Request to .TK Domain with Minimal Headers"; flow:established,to_server; http.host; content:".tk"; fast_pattern; endswith; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:22; endswith; classtype:bad-unknown; sid:2031094; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_23, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_05;)