alert dns $HOME_NET any -> any any (msg:"ET MALWARE ServHelper CnC Domain"; dns.query; content:"joisff333.icu"; nocase; endswith; classtype:command-and-control; sid:2027305; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_01, deployment Perimeter, confidence High, signature_severity Major, tag ServHelper, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)