alert dns $HOME_NET any -> any any (msg:"ET MALWARE Observed DNS Query to Vicious Panda CnC Domain"; dns.query; content:"wind.windmilldrops.com"; bsize:22; reference:url,research.checkpoint.com/2020/vicious-panda-the-covid-campaign; classtype:domain-c2; sid:2029631; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_13, deployment Perimeter, deprecation_reason Age, confidence High, signature_severity Major, updated_at 2023_12_27, reviewed_at 2023_12_27;)