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CISA, along with the NSA, FBI, and international cybersecurity partners, has issued a joint advisory regarding the increasing use of the "fast flux" technique by cybercriminals and nation-state actors. This DNS evasion method allows attackers to rapidly change the DNS records associated with their malicious servers, making it difficult to track and block their activities. This tactic is used to obfuscate the location of malicious servers, enabling them to create resilient and highly available command and control infrastructures while concealing malicious operations.

Fast flux, characterized by quickly changing IP addresses linked to a single domain, exploits weaknesses in network defenses. The advisory, titled 'Fast Flux: A National Security Threat,' urges organizations, internet service providers (ISPs), and security firms to strengthen their defenses against these attacks. Service providers, especially Protective DNS providers (PDNS), are urged to track, share information, and block fast flux activity to safeguard critical infrastructure and national security.

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References :

• CyberInsider: CISA Warns of ‘Fast Flux’ Technique Hackers Use for Evasion
• The Register - Security: For flux sake: CISA, annexable allies warn of hot DNS threat
• Industrial Cyber: Advisory warns of fast flux national security threat, urges action to protect critical infrastructure
• Cyber Security News: Hackers Leveraging Fast Flux Technique to Evade Detection & Hide Malicious Servers
• BleepingComputer: CISA, the FBI, the NSA, and international cybersecurity agencies are calling on organizations and DNS providers to mitigate the "Fast Flux" cybercrime evasion technique used by state-sponsored threat actors and ransomware gangs.
• BleepingComputer: CISA warns of Fast Flux DNS evasion used by cybercrime gangs
• The DefendOps Diaries: Understanding and Combating Fast Flux in Cybersecurity
• bsky.app: CISA, the FBI, the NSA, and international cybersecurity agencies are calling on organizations and DNS providers to mitigate the "Fast Flux" cybercrime evasion technique used by state-sponsored threat actors and ransomware gangs.
• www.csoonline.com: Cybersecurity agencies urge organizations to collaborate to stop fast flux DNS attacks
• hackread.com: NSA and Global Allies Declare Fast Flux a National Security Threat
• : National Security Agencies Warn of Fast Flux Threat Bypassing Network Defenses
• www.itpro.com: Cybersecurity agencies have issued a stark message that too little is being done to sniff out malware hiding in corporate networks
• Infoblox Blog: Disrupting Fast Flux with Predictive Intelligence
• www.cybersecuritydive.com: Cybersecurity Dive on CISA FBI warn
• Threats | CyberScoop: International intelligence agencies raise the alarm on fast flux
• Infoblox Blog: Disrupting Fast Flux and Much More with Protective DNS
• blogs.infoblox.com: Disrupting Fast Flux and Much More with Protective DNS
• The Hacker News: Cybersecurity agencies from Australia, Canada, New Zealand, and the United States have published a joint advisory about the risks associated with a technique called fast flux that has been adopted by threat actors to obscure a command-and-control (C2) channel.
• thecyberexpress.com: The U.S. Cybersecurity and Infrastructure Security Agency (CISA), alongside the National Security Agency (NSA), the Federal Bureau of Investigation (FBI), and international cybersecurity partners, has issued an urgent advisory titled “Fast Flux: A National Security Threat.†The advisory highlights the growing use of fast flux techniques by cybercriminals and potentially nation-state actors to evade detection and establish highly resilient and stealthy infrastructure for malicious activities.

Classification:

• HashTags: #FastFlux #DNS #Cybersecurity
• Company: DNS Providers
• Target: Organizations, ISPs
• Product: DNS
• Feature: DNS evasion
• Type: HighRisk
• Severity: Major