Raymond Evans - CTF organizer for nolacon and Founder of CyDefe Labs
https://www.youtube.com/watch?v=4ZtFk2dtqv0 (A cat explains DNS)
Logging detailed DNS queries and responses can be beneficial for many reasons. For the first and most obvious reason is to aid in incident response. DNS logs can be largely helpful for tracking down malicious behavior, especially on endpoints in a DHCP pool. If an alert is received with a specific IP address, that IP address may not be on the same endpoint by the time someone ends up investigating. Not only does that waste time, it also gives the malicious program or attacker more time to hide themselves or spread to other machines.
DNS is also useful for tracking down other compromised hosts, downloads from malicious websites, and if malware is using Domain Generating Algorithms (DGAs) to mask malicious behavior and evade detection.
NOTE: However if a Microsoft DNS solution (prior to server 2012) is in use, according to Microsoft, “Debug logging can be resource intensive, affecting overall server performance and consuming disk space. Therefore, it should only be used temporarily when more detailed information about server performance is needed.” From Server 2012 forward DNS analytic logging is much less resource intensive. If the organization is using BIND or some DNS appliance, it should have the capability to log all information about DNS requests and replies.
How difficult has that become with the advent of GDPR and whois record anonymization?
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