alert ftp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO .exe File requested over FTP"; flow:established,to_server; dsize:>10; content:"RETR"; depth:4; content:".exe|0d 0a|"; distance:0; pcre:"/^RETR\s+[^\r\n]+?\x2eexe\r?$/m"; classtype:misc-activity; sid:2014906; rev:3; metadata:attack_target Client_and_Server, created_at 2012_06_15, deployment Perimeter, deployment alert_only, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_01;)