alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET HUNTING Possible EXE Download From Suspicious TLD (.science) - set";
flow:established,to_server;
flowbits:set,ET.SuspExeTLDs;
flowbits:noalert;
http.host;
content:".science"; fast_pattern; endswith;
reference:url,www.spamhaus.org/statistics/tlds/;
classtype:misc-activity;
sid:2023454; rev:4;
metadata:affected_product Any, attack_target Client_and_Server, created_at 2016_10_27, confidence Medium, signature_severity Minor, updated_at 2020_10_07;
)