alert http $HOME_NET any -> any any (msg:"AT related malicious URL (ecert.am/.well-known/)"; flow:established,to_server; http.uri; content:"/.well-known/"; startswith; fast_pattern; http.host; content:"ecert.am"; endswith; reference:url,openphish.com; reference:url,julioliraup.github.io/ET/signature.html?sid=6006493; classtype:social-engineering; sid:6006493; rev:1; metadata:signature_severity Major, created_et 2026_05_24;)