Adversaries may use Fast Flux DNS to hide a command and control channel behind an array of rapidly changing IP addresses linked to a single domain resolution. This technique uses a fully qualified domain name, with multiple IP addresses assigned to it which are swapped with high frequency, using a combination of round robin IP addressing and short Time-To-Live (TTL) for a DNS resource record.[1],[2],[3]
The simplest, "single-flux" method, involves registering and de-registering an addresses as part of the DNS A (address) record list for a single DNS name. These registrations have a five-minute average lifespan, resulting in a constant shuffle of IP address resolution.[3]
In contrast, the "double-flux" method registers and de-registers an address as part of the DNS Name Server record list for the DNS zone, providing additional resilience for the connection. With double-flux additional hosts can act as a proxy to the C2 host, further insulating the true source of the C2 channel.
References
- Mehta, L. (2014, December 17). Fast Flux Networks Working and Detection, Part 1. Retrieved March 6, 2017.
- Mehta, L. (2014, December 23). Fast Flux Networks Working and Detection, Part 2. Retrieved March 6, 2017.
- Albors, Josep. (2017, January 12). Fast Flux networks: What are they and how do they work?. Retrieved March 11, 2020.
Linkede sager
| Linktype | Sag |
|---|---|
| is related to | Techniques |
| is blocked by | Detection Strategy for Dynamic Resolution using Fast Flux DNS |
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