alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Suspicious User-Agent (CustomStringHere)"; flow:established,to_server; http.user_agent; content:"CustomStringHere"; reference:md5,7a8cb1223e006bc7e70169c060d7057b; classtype:misc-activity; sid:2025436; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_03_19, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_24;)