alert dns $HOME_NET any -> any any (msg:"ET MALWARE DNSChanger CnC Domain in DNS Lookup"; dns.query; content:"downloadsecurity.info"; nocase; endswith; reference:url,otx.alienvault.com/pulse/5d8c92c1a08aa6bd58eca488; classtype:command-and-control; sid:2028638; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_01, deployment Perimeter, malware_family DNSChanger, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17;)