Use DNS Filtering Services   Almost everything malicious has to make a phone call. A phishing link has to resolve to a web address. Malware has to reach back to its operator for instructions. Ransomware often checks in before it starts encrypting. Every one of those steps begins the same way, by looking up a domain name. DNS filtering sits at that lookup and refuses to connect to destinations known to be dangerous, which means a surprising number of attacks fail at the very first step,...