threatpost[.]com/dns-spoofing-attacks/141880/
This article does a nice job explaining what it is & why it's a problem, though it doesn't say anything about how the average consumer can watch out for it. Briefly, changing the DNS server address [URL] you use when you go online sends you to server controlled by a cybercriminal or group -- from then on nothing you see or visit or download can be trusted. Malware can change the DNS Windows uses, &/or the DNS server the router uses when Windows doesn't specify a DNS URL. Home & small biz routers [& sometimes modems] are a HUGE target, since their security measures are often minimal, and manufacturer response slow to nonexistent when vulnerabilities are reported. Taking over routers can also make them available for DDoS attacks [Distributed Denial Of Service], where a site is so flooded with traffic that it's unusable &/or crashes, usually done out of malice or for a fee.