alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Terse Request for .pif"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".pif"; fast_pattern; endswith; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|cache-"; content:!"|0d 0a|pragma"; content:!"|0d 0a|referer|0d 0a|"; classtype:bad-unknown; sid:2030392; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_25, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2024_04_30;)