alert dns $HOME_NET any -> any any (msg:"ET MALWARE APT-C-27 CnC Domain Observed in DNS Query"; dns.query; content:"privatehd.us.to"; nocase; endswith; reference:url,otx.alienvault.com/pulse/5da9dc215c51c8a86a2d19f1; classtype:domain-c2; sid:2028874; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_10_18, deployment Perimeter, confidence High, signature_severity Major, tag APT_C_27, updated_at 2020_10_20;)