alert dns $HOME_NET any -> any any (msg:"ET MALWARE Restylink Domain in DNS Lookup (officehoster .com)"; dns.query; dotprefix; content:".officehoster.com"; nocase; endswith; reference:url,insight-jp.nttsecurity.com/post/102hojk/operation-restylink-apt-campaign-targeting-japanese-companies; classtype:trojan-activity; sid:2036606; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_05_17, deployment Perimeter, deprecation_reason Age, malware_family Restylink, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_04_17, reviewed_at 2024_04_17;)