alert tcp $HOME_NET any -> $EXTERNAL_NET 21 (msg:"ET MALWARE Delf Keylog FTP Upload"; flow:established,to_server; content:"STOR "; depth:5; content:" Keylogger ["; nocase; distance:5; within:50; content:"].txt|0d 0a|"; nocase; distance:5; within:40; classtype:trojan-activity; sid:2007858; rev:2; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_07_26;)