In today's post we are going to talk about the common DNS attacks used by malwares called Fast Flux. This may fall under the "Command and Control" Category in MITRE ATT&CK Framework.
In order to avoid blocking a malware owner quickly changes the resolved IP Addresses. So, every-time you'll query a host-name it'll give you a different IP Address. Usually, time to live (TTL) for each IP address is around 300 Seconds. This technique is most commonly used by Botnets. A key thing to remember is the DNS Servers participates in the Fast-Flux is usually for Malicious purpose.
Look for TTL < 300
DNS Count > 12
Recently registered domain.
Learn more about Fast Flux: http://www.honeynet.org/node/136