alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Possible Malicious Document Request to .tk domain"; flow:established,to_server; http.user_agent; content:"Microsoft Office Protocol Discovery"; startswith; endswith; http.host; content:".tk"; endswith; fast_pattern; classtype:misc-activity; sid:2030513; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_07_14, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)