alert dns $HOME_NET any -> any any (msg:"ET INFO RustDesk Relay Domain in DNS Lookup"; dns.query; content:"rs-"; startswith; fast_pattern; pcre:"/[a-z]{2}/Ri"; dotprefix; content:".rustdesk.com"; nocase; endswith; reference:url,rustdesk.com; classtype:misc-activity; sid:2044076; 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;)