alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY IP Check Domain (showip in HTTP Host)"; flow:established,to_server; http.method; content:"GET"; http.host; content:"showip."; fast_pattern; pcre:"/^[^\r\n]*showip\.[a-z]+(?:\x3a\d{1,5})?\r?$/Wm"; classtype:attempted-recon; sid:2008987; rev:9; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_09, reviewed_at 2024_05_01;)