alert udp $HOME_NET any -> $EXTERNAL_NET 21116 (msg:"ET INFO RustDesk Register Peer where serial=1"; dsize:15; content:"|32 0d 0a 09|"; startswith; fast_pattern; content:"|10 01|"; distance:9; within:2; endswith; threshold:type limit, seconds 30, count 1, track by_src; reference:url,github.com/rustdesk/rustdesk/issues/594; classtype:misc-activity; sid:2044070; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_02_02, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_02;)