alert tcp $HOME_NET any -> $EXTERNAL_NET 21 (msg:"ET MALWARE HawkEye Keylogger FTP"; flow:established,to_server; content:"STOR HawkEye"; nocase; pcre:"/^(?:_|Keylogger)/Ri"; reference:md5,85f3b302afa0989a91053af6092f3882; classtype:trojan-activity; sid:2020410; rev:4; metadata:created_at 2015_02_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)