DNS/Switcherについて、ここに記述してください。
Android Trojan Switcher Infects Routers via DNS Hijacking
https://threatpost.com/android-trojan-switcher-infects-routers-via-dns-hijacking/122779
A new Android Trojan, Switcher, uses victims’ devices to infect WiFi routers and funnel users of the network to malicious sites.