alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Observed Suspicious UA (DxD)"; flow:established,to_server; http.user_agent; bsize:3; content:"DxD"; fast_pattern; classtype:bad-unknown; sid:2029232; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_01_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_01_06;)