alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP SITE EXEC format string"; flow:to_server,established; content:"SITE EXEC %020d|7C|%.f%.f|7C 0A|"; depth:32; nocase; reference:arachnids,453; reference:bugtraq,1387; reference:cve,2000-0573; classtype:attempted-user; sid:2100338; rev:11; metadata:created_at 2010_09_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)