alert dns any any -> $HOME_NET any (
msg:"ET PHISHING Suspected Appspot Hosted Phishing Domain";
dns.query;
content:!"www.";
content:"-dot-";
content:".appspot.com"; fast_pattern;
isdataat:!1,relative;
pcre:"/^[a-z]{36,38}\-dot\-[a-z]+\-[a-z]+\-\d{6}\.[a-z]{2}\.[a-z]\.appspot\.com$/";
classtype:social-engineering;
sid:2031149; rev:2;
metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_10_30, deployment Perimeter, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_30;
)