alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP wu-ftpd 2.6.0"; flow:to_server,established; content:"..11venglin@"; reference:arachnids,440; reference:bugtraq,1387; classtype:attempted-user; sid:2100348; rev:9; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)