alert http $HOME_NET any -> any any (msg:"AT related malicious URL (zrr.kr/o1sfDh)"; flow:established,to_server; http.uri; content:"/o1sfDh"; startswith; fast_pattern; http.host; content:"zrr.kr"; endswith; reference:url,openphish.com; reference:url,julioliraup.github.io/ET/signature.html?sid=6005592; classtype:social-engineering; sid:6005592; rev:1; metadata:signature_severity Major, created_et 2026_05_22;)