alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"GPL FTP REST with numeric argument"; flow:to_server,established; content:"REST"; nocase; pcre:"/REST\s+[0-9]+\n/i"; reference:bugtraq,7825; classtype:attempted-recon; sid:2103460; rev:3; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)