alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Executable Download from dotted-quad Host"; flow:established,to_server; http.uri; content:".exe"; fast_pattern; endswith; nocase; http.host; content:"."; offset:1; depth:3; content:"."; within:4; content:"."; within:4; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/"; classtype:bad-unknown; sid:2016141; rev:9; metadata:attack_target Client_and_Server, created_at 2013_01_03, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2024_04_08;)