Cybersecurity agencies from the U.S., Australia, Canada, and New Zealand have warned about the fast flux technique used by threat actors to camouflage their command-and-control operations. This method exploits vulnerabilities in network defenses by quickly rotating DNS records associated with a single malicious domain. First identified in 2007, fast flux can either involve a single domain linking to multiple IP addresses or frequently changing both IPs and DNS servers for enhanced anonymity. It has been used by various hacking groups, complicating law enforcement's efforts to dismantle their operations.
Fast flux is a technique used to obfuscate the locations of malicious servers through rapidly changing Domain Name System (DNS) records associated with a single domain name.
A fast flux network is 'fast' because, using DNS, it quickly rotates through many bots, using each one for only a short time to make IP-based denylisting and takedown efforts difficult.
This threat exploits a gap commonly found in network defenses, making the tracking and blocking of malicious fast flux activities difficult.
Fast flux has been embraced by many a hacking group in recent years, including threat actors linked to Gamaredon, CryptoChameleon, and Raspberry Robin.
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