The National Security Agency (NSA) and Cybersecurity and Infrastructure Agency (CISA) released a joint information sheet Thursday that offers guidance on the benefits of using a Protective Domain Name System (PDNS).

A PDNS service uses existing DNS protocols and architecture to analyze DNS queries and mitigate threats. It leverages various open source, commercial, and governmental threat feeds to categorize domain information and block queries to identified malicious domains.

According to NSA and CISA, the service provides defenses in various points of the network exploitation lifecycle, addressing phishing, malware distribution, command and control, domain generation algorithms, and content filtering. A PDNS can log and save suspicious queries and provide a blocked response, delaying or preventing malicious actions – such as ransomware locking victim files – while letting organizations investigate using those logged DNS queries.

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