alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP CWD .... attempt"; flow:to_server,established; content:"CWD "; content:" ...."; reference:bugtraq,4884; classtype:denial-of-service; sid:2101779; rev:5; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)