alert dns $HOME_NET any -> any any (msg:"ET MALWARE APT 41 CnC Domain Observed in DNS Query"; dns.query; content:"svn-dns.ahnlabinc.com"; nocase; endswith; reference:url,www.welivesecurity.com/wp-content/uploads/2019/10/ESET_Winnti.pdf; classtype:domain-c2; sid:2028839; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_10_16, deployment Perimeter, malware_family LOWKEY, confidence High, signature_severity Major, tag APT41, updated_at 2020_10_19;)