alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY External IP Address Request via wttr .in"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/?format="; startswith; http.host; content:"wttr.in"; endswith; fast_pattern; http.header_names; content:!"Referer"; classtype:policy-violation; sid:2033354; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_07_16, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_16;)