alert dns $HOME_NET any -> any any (msg:"ET MALWARE Hisoka CnC Domain Observed in DNS Query"; dns.query; content:"google-update.com"; bsize:17; nocase; reference:url,unit42.paloaltonetworks.com/xhunt-campaign-new-watering-hole-identified-for-credential-harvesting; classtype:domain-c2; sid:2029328; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_29, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_01_29;)