alert tcp $HOME_NET any -> $EXTERNAL_NET [25,587] (msg:"ET MALWARE Beastdoor Keylogger Report via SMTP"; flow:established,to_server; content:"From|3a|"; nocase; content:"Subject|3a 20|Keylogger"; content:"Victim IP-"; reference:md5,ad99a0a85e1410559030464aac390969; classtype:trojan-activity; sid:2019927; rev:1; metadata:created_at 2014_12_13, signature_severity Major, updated_at 2019_07_26;)