alert dns $HOME_NET any -> any any (msg:"ET MALWARE Mirai Botnet Domain Observed"; dns_query; content:"nympompksmfx.tech"; depth:17; nocase; endswith; fast_pattern; reference:url,blog.opendns.com/2016/12/13/query-volumes-mirai-dgas/; classtype:trojan-activity; sid:2023630; rev:4; metadata:attack_target Networking_Equipment, created_at 2016_12_13, deployment Perimeter, malware_family Mirai, confidence High, signature_severity Major, updated_at 2019_09_28;)