Fast Flux DNS - T1568.001 (29ba5a15-3b7b-4732-b817-65ea8f6468e6)

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.(Citation: MehtaFastFluxPt1)(Citation: MehtaFastFluxPt2)(Citation: Fast Flux - Welivesecurity)

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.(Citation: Fast Flux - Welivesecurity)

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.

Cluster A	Galaxy A	Cluster B	Galaxy B	Level
Fast Flux DNS - T1568.001 (29ba5a15-3b7b-4732-b817-65ea8f6468e6)	Attack Pattern	Dynamic Resolution - T1568 (7bd9c723-2f78-4309-82c5-47cad406572b)	Attack Pattern	1