alert http $HOME_NET any -> any any (msg:"AT related malicious URL (121z2.catex.at/trs/)"; flow:established,to_server; http.uri; content:"/trs/"; startswith; fast_pattern; http.host; content:"121z2.catex.at"; endswith; reference:url,openphish.com; reference:url,julioliraup.github.io/ET/signature.html?sid=6003982; classtype:social-engineering; sid:6003982; rev:1; metadata:signature_severity Major, created_et 2026_05_20;)