alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP MKD / possible warez site"; flow:to_server,established; content:"MKD"; nocase; content:"/ "; distance:1; classtype:misc-activity; sid:2100554; rev:9; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)