alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Request for Terse Numeric .dat File"; flow:established,to_server; http.uri; content:".dat"; fast_pattern; endswith; pcre:"/\/[0-9]{1,2}\.dat$/"; 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:2030225; rev:3; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2020_05_27, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2024_04_30;)