alert http $HOME_NET any -> any any (msg:"AT related malicious URL (wwwkaiyun123.com/)"; flow:established,to_server; http.uri; content:"/"; startswith; fast_pattern; http.host; content:"wwwkaiyun123.com"; endswith; reference:url,openphish.com; reference:url,julioliraup.github.io/AT/signature.html?sid=6018010; classtype:social-engineering; sid:6018010; rev:1; metadata:signature_severity Major, created_et 2026_07_06;)