alert dns $HOME_NET any -> any any (msg:"ET MALWARE Restylink Domain in DNS Lookup (sseekk .xyz)"; dns.query; dotprefix; content:".sseekk.xyz"; nocase; endswith; reference:url,insight-jp.nttsecurity.com/post/102hojk/operation-restylink-apt-campaign-targeting-japanese-companies; classtype:trojan-activity; sid:2036608; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_05_17, deployment Perimeter, malware_family Restylink, performance_impact Low, confidence High, signature_severity Major, updated_at 2022_12_16;)