CISA, FBI warn of fast flux technique used to hide malicious servers

FBI, CISA warns of new Fast Flux DNS evasion being used by cyber gangs

US agencies are urging organizations take a unified stand against the rising threat.

CISA, FBI warn of fast flux technique used to hide malicious servers

Criminal and state-linked hackers use fast-changing DNS records to make it harder for defenders to detect or disrupt malicious activity.

The Fast Flux DNS Threat: A Call to Action Against a Geopolitical and Hacktivist Nightmare

Imagine a digital hydra: cut off one head, and ten more sprout in its place. That’s Fast Flux DNS—a cunning technique used by cybercriminals and nation-state actors to keep malicious networks alive by constantly shifting IP addresses and name servers. On April 2, 2025, the NSA, alongside CISA, the FBI, and international allies, sounded the alarm with their “Fast Flux: A National Security Threat” advisory. This isn’t just a technical nuisance—it’…