alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP FTP 'MKD .' possible warez site"; flow:established,to_server; content:"MKD ."; depth:5; nocase; classtype:misc-activity; sid:2100548; rev:8; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_08;)