alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP FTP no password"; flow:from_client,established; content:"PASS"; nocase; pcre:"/^PASS\s*\n/smi"; reference:arachnids,322; classtype:unknown; sid:2100489; rev:9; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)