alert tcp $HOME_NET any -> $EXTERNAL_NET 21 (msg:"ET MALWARE Predator Pain Keylogger FTP"; flow:established,to_server; content:"STOR Predator_Pain"; reference:md5,c9025c9835d1b7d6f0dd2390ea7d5e18; classtype:trojan-activity; sid:2020412; rev:1; metadata:created_at 2015_02_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)