alert tcp $HOME_NET 1024: -> any 1024: (msg:"ET ATTACK_RESPONSE Off-Port FTP Without Banners - user"; flow:established,from_server; dsize:>7; content:"USER "; depth:5; offset:0; content:" |0d 0a|"; distance:1; flowbits:set,ET.strippedftpuser; classtype:trojan-activity; sid:2007715; rev:9; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)