alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO External Timezone Check (earthtools.org)"; flow:established,to_server; http.uri; content:"/timezone/"; startswith; http.host; bsize:18; content:"www.earthtools.org"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; classtype:policy-violation; sid:2021120; rev:6; metadata:created_at 2015_05_20, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)