Question

Fast-flux service networks - how does the botmaster use

a) To improve internet speed
b) To create secure networks
c) To evade detection and make tracking difficult
d) To provide reliable DNS services

Answer 1

Fast-flux is a technique used by botnets to evade detection and provide reliable DNS services by rapidly changing the IP addresses domain names resolve to, making it difficult for authorities to track down malicious servers.

Step-by-step explanation:

Fast-flux is a DNS technique used by botnets to hide phishing and malware delivery sites behind an ever-changing network of compromised hosts acting as proxies. It can be used to:

• Evade detection and make tracking difficult: By rapidly changing the IP addresses that domain names resolve to, it is harder for law enforcement and security professionals to track down the actual servers hosting malicious content.
• Create secure networks for the botnet's operational purposes, although this security does not extend to victims of the botnet.
• Provide reliable DNS services to the botnet by enabling the quick substitution of downed or blocked hosts.

It is not typically used to improve internet speed for the end-users and is actually only 'reliable' from the perspective of the botnet operators maintaining their network's uptime and resilience to takedown attempts.