alert ftp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL FTP invalid MDTM command attempt"; flow:to_server,established; content:"MDTM"; fast_pattern; nocase; pcre:"/^MDTM \d+[-+]\D/smi"; reference:bugtraq,9751; reference:cve,2001-1021; reference:cve,2004-0330; classtype:attempted-admin; sid:2102416; rev:8; metadata:created_at 2010_09_23, cve CVE_2001_1021, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)