alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Proxy Server Lookup (nntime)"; flow:established,to_server; http.method; content:"GET"; http.host; content:"nntime.com"; bsize:10; reference:md5,a09f817656ca4336581140fe81921f71; classtype:misc-activity; sid:2030230; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_05_29, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_29;)