DNS

DNS: The Secret Weapon CISOs May Be Overlooking in the Fight Against Cyberattacks

DNS is a crucial yet underutilized asset for Chief Information Security Officers (CISOs) in combating cyberattacks. As the first point of detection, DNS can prevent attacks by blocking malicious queries, disrupting command-and-control communications, and stopping data exfiltration. Recent advancements in AI have enabled cybercriminals to adapt rapidly, creating polymorphic malware and sophisticated phishing campaigns. By leveraging protective DNS combined with threat intelligence, CISOs can proactively safeguard their networks from evolving threats, urging a strategic shift to utilize DNS as a frontline defense system in the cybersecurity landscape.

https://www.securityweek.com/dns-the-secret-weapon-cisos-may-be-overlooking-in-the-fight-against-cyberattacks/

Strengthening Email Ecosystem: Outlook’s New Requirements for High‐Volume Senders

Outlook introduces stricter email authentication standards for domains sending over 5,000 emails daily, requiring SPF, DKIM, and DMARC compliance to enhance inbox security and reduce spoofing and spam. Non-compliance will lead to messages being routed to Junk and eventually rejected. Organizations are advised to audit their DNS records and implement transparent mailing practices. Enforcement begins in May 2025. These measures aim to protect users and improve deliverability for legitimate senders, encouraging industry-wide best practices.

https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook’s-new-requirements-for-high‐volume-senders/4399730

Sender Policy Framework (SPF)

SPF: Email authentication method, prevents spoofing by verifying sender IP against authorized domains. Enhances deliverability, reduces spam. Uses DNS records.

TR-92 – Unused Domain Names and the Risks of Missing DNS SPF Records

Unused domains pose security risks due to missing DNS SPF records, enabling phishing and malware attacks. Organizations should inventory domains, implement SPF, DKIM, and DMARC records, regularly audit DNS configurations, and educate staff on cybersecurity. Addressing these vulnerabilities is essential for protecting the organization’s reputation.

https://www.circl.lu/pub/tr-92/

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