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Flux off: CISA, annexable allies warn of hot DNS threat
- The US government's Cybersecurity Infrastructure Agency (CISA) is warning organizations, ISPs, and security firms about fast flux attacks that obscure malicious servers by rapidly altering DNS records.
- Fast flux is used by cybercriminals and nation-state actors to hide the locations of malicious servers and create resilient command and control infrastructure.
- CISA and other cyber authorities view DNS deception through fast flux as a threat to national security.
- Fast flux involves constantly changing DNS records to avoid detection, creating challenges for security measures like DNS filtering.
- There are two types of fast flux attacks: single flux and double flux, both relying on botnets to relay information and make blocking malicious infrastructure difficult.
- CISA recommends using threat intelligence feeds, boundary firewalls, DNS resolvers, and SIEM services to detect and defend against fast flux attacks.
- Additionally, they advise paying attention to TTL values in DNS records, as fast flux domains often have unusually low TTL values.
- Implementing anomaly detection systems, reviewing DNS resolution, analyzing flow data, and developing fast flux detection algorithms are among the recommended defense techniques.
- The advisory promotes the use of Protective DNS providers to mitigate fast flux attacks and emphasizes establishing DNS authority within organizations.
- Filtering DNS lookups for fast-flux domains and monitoring suspicious queries are suggested strategies to combat fast flux attacks.
- Overall, organizations need to be vigilant and proactive in protecting against fast flux attacks by strengthening their DNS defenses and staying informed about evolving threat landscapes.
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