alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP FTP anonymous ftp login attempt"; flow:established,to_server; content:"USER"; nocase; content:" ftp|0D 0A|"; nocase; classtype:misc-activity; sid:2101449; rev:10; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08;)