alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE SEASALT Server Response"; flow:established,from_server; dsize:7; content:"fxftest"; depth:7; reference:md5,5e0df5b28a349d46ac8cc7d9e5e61a96; reference:url,www.mandiant.com/apt1; classtype:trojan-activity; sid:2016442; rev:2; metadata:created_at 2013_02_20, signature_severity Major, updated_at 2019_07_26;)