Protective DNS by Quad9

Table of Content

Covid-19, WFH and data security

When Covid-19 was declared a pandemic, threat actors saw an opportunity and there’s a rise in Covid-19 related cyber attacks. From “Covid-19 vaccine” to “Covid-19 relief programs”, Covid 19 was used as a bait, using phishing emails and website pop-ups as the tools for the attack.

Cybercriminals manipulated the internet and trick users into opening a malicious attachment or clicking a malicious URL. Hackers create websites that appear to be legitimate. Users are unable to confirm the legitimacy of these website thus becoming a victim of cyber attack.

Work from home (WFH) program was supposed to protect employees from the Covid-19 virus and keep people safe. But WFH create a security problem that was exploited by threat actors. WFH means laptops and computer operating outside the company’s firewall. These devices are vulnerable from attacks. Providing more potential victims to be hacked.

Many people and institutions, from government to corporations, hospitals and schools, fell victim to hackers. These cost billions in lost business and productivity. Not to mention lost data and data breaches that created another set of information security nightmare

Protect us from phishing emails and malicious website.

Consumers and small businesses need a way to protect themselves that is effective, easy to configure, reliable, affordable, and protects their privacy.

One way to protect our system from visiting malicious website is to use a protective DNS service. There are a number of protective DNS service provider where we can choose from.

Without Protective DNS service

A user clicks on a link and visits a dangerous website ( and download a malware installer.

The malware connects to a site ( and downloads additional malware that further infects the system.

The malware communicates to a command and control server ( which exploit the system for other malicious purpose.

With Protective DNS service

When a user clicks a malicious link, the browser contacts the PDNS server to resolve the domain. If the domain is malicious, the PDNS will provide a no respond message which will cause the browser to issue a “Can’t find that site” error. This prevents the malware installation.

Quad9 Protective DNS Service

Quad9 is free and provides end users security and privacy. Quad9 protects users from accessing malware, malicious domains, botnet infrastructure, and more. Leveraging threat intelligence from multiple industry leaders; it currently blocks up to sixty million threats per day.

Quad9 blocks against known malicious domains, preventing computers from connecting to malware or phishing sites. Whenever a Quad9 user clicks on a website link or types in an address into a web browser, Quad9 checks the site against a list of domains provided by 19 different threat intelligence partners.

Based on the results, Quad9 resolves or denies the lookup attempt, preventing connections to malicious sites when there is a match.

Protect your data thru PDNS

Protective DNS is an effective and simple way to protect your data no matter whose PDNS service you use. A recent study shows that around 30% of cyber-crime events (total) could be mitigated by using a PDNS.

PDNS are not only useful for phishing spam or lookalike links in web pages – but they protect against much more. Malware and spyware that gets installed through other means often will try to “phone home” or trick your browser into visiting lookalike pages, and PDNS can help with that protection.