DNS Attacks

It seems that our topic for today is centered around the most common 10 DNS attacks and how to effectively mitigate them. We’ll dive into the details of each attack, their potential impact, and recommended measures to help protect against them.

DNS stands for the system, which remains under constant attack, and thus, we can assume there is no end in sight because the threats are growing increasingly nowadays.

DNS generally uses UDP fundamentally and, in some cases, uses TCP as well. It uses the UDP protocol, which is connectionless and can be tricked easily.

Thus, the DNS protocol is remarkably popular as a DDoS tool, and DNS is recognized as the internet’s phonebook, which is a component of the global internet foundation that transmutes between well-known names and the number that a computer needs to enter a website and send an email.

DNS has long been the target of attackers looking to take all corporate and secret data; hence, the warnings in the past year indicate a worsening of the condition.

As per the IDC’s research, the average costs correlated with a DNS mugging rose by 49% compared with a year earlier.

However, in the U.S., the average price of a DNS attack trims out at more than $1.27 million.

Approximately half of the respondents (48%) state that they wasted more than $500,000 on a DNS attack, and about 10% say that they lost more than $5 million on each break.

In extension, the preponderance of U.S. companies say that it took more than one day to determine a DNS attack.

Shockingly, as per the information, both in-house and cloud applications were destroyed, and the 100% growth of threats in the in-house application interlude is now the most widespread destruction experienced by IDC.

Thus, “DNS attacks are running away from real brute force to more complicated attacks running from the internal network.

Thus, the complicated attack will push the organizations to use intelligent mitigation tools so that they can easily cope with insider threats.”

Therefore, we have provided the top 10 DNS attacks and the proper solutions to fix them so that it will be easy for organizations to recognize the attacks and quickly solve them.

What is a DNS Attack?

An attack on the domain name system (DNS) can take several forms. Malicious actors can exploit DNS vulnerabilities in a variety of ways.

The majority of these attacks are aimed at blocking users from accessing specific websites by misusing the Domain Name System (DNS). Denial-of-service (DoS) attacks are a broad category that includes these incidents.

DNS vulnerabilities can also be used in a technique known as DNS hijacking, which redirects users to hostile websites.

With techniques like DNS tunneling, attackers can exploit the DNS protocol to secretly transmit data outside of an organization.

What type of attack is a DNS attack?

When an attacker takes advantage of flaws in the DNS, they are launching a DNS attack.

What is a DNS attack by a hacker?

Due to the fact that DNS requests and responses are not always encrypted, browsers are vulnerable to DNS hijacking attacks.

A hacker can extort money from you by sending you to one of their malicious websites if they intercept you here.

Is the DNS firewall safe?

In order to prevent phishing and malware downloads at the DNS level, a DNS firewall can automatically block the most dangerous traffic sources.

By preventing resolved responses to intercepted DNS queries, networks, and devices are protected from potential threats.

In order to prevent phishing and malware downloads at the DNS level, a DNS firewall can automatically block the most dangerous traffic sources.

Due to the fact that DNS requests and responses are not always encrypted, browsers are vulnerable to DNS hijacking attacks.

A hacker can extort money from you by sending you to one of their malicious websites if they intercept you here.

Table of Contents

What is a DNS Attack?
What type of attack is a DNS Attack?
What is a DNS attack by a Hacker?
Is the DNS Firewall safe?
10 Dangerous DNS Attack Types
10 Famous DNS Attacks Type Features
1. DNS Cache Poisoning Attack
2. Distributed Reflection Denial of Service
3. DNS Hijacking
4. Phantom Domain Attack
5. DNS Flood Attack
6. Random Subdomain Attack
7. Botnet-based Attacks
8. Domain Hijacking
9. DNS Tunneling
10. TCP-SYN Floods
11.DNS Attack Mitigation
Also Read

10 Dangerous DNS Attack Types

  • DNS Cache Poisoning Attack
  • Distributed Reflection Denial of Service
  • DNS Hijacking
  • Phantom Domain Attack
  • TCP-SYN Floods
  • Random Subdomain Attack
  • DNS Tunneling
  • Domain Hijacking
  • Botnet-based Attacks
  • DNS Flood Attack
  • DNS Attack Mitigation

10 Famous DNS Attacks Type Features

Famous DNS Attacks TypeFeatures
1. DNS Cache Poisoning Attack1. Exploitation of DNS Caching
2. Spoofing DNS Responses
3. Manipulation of DNS Records
4. DNS Transaction ID Spoofing
5.Putting network functions and communication at risk.
2. Distributed Reflection Denial of Service 1. Amplification
2. Reflection
3. Distributed Nature
4. IP Spoofing
5. Because it is spread, it is hard to fix.
3. DNS Hijacking1. Manipulation of DNS Records
2. Phishing and Credential Theft
3. Malware Distribution
4. DNS Server Compromise
5.Credentials may have been stolen.
4. Phantom Domain Attack1. Amplification
2. Reflection
3. Distributed Nature
4. IP Spoofing
5. Because it is spread, it is hard to fix.
5. DNS Flood Attack1. Massive DNS Query Traffic
2. UDP or TCP Protocol
3. Spoofed Source IP Addresses
4. Amplification and Reflection Techniques
5.To combat, use mitigation.
6. Random Subdomain Attack1. It makes a lot of strange subdomains.
2. aims at DNS and domain systems.
3. DNS servers and authoritative services are overloaded.
4. hides the purpose of the attack.
5. It could mess up DNS resolution and the operation of services.
7. Botnet-based Attacks1. Botnet Formation
2. Command and Control (C&C)
3. Distributed and Coordinated Attacks
4. DDoS Attacks
5. It’sard to find the specific attackers.
8. Domain Hijacking1. Unauthorized Transfer of Ownership
2. DNS Configuration Manipulation
3. Subdomain Creation or Modification
4. Email Account Takeover
5.Needs security and domain recovery methods.
9. DNS Tunneling1. Protocol Abuse
2. Encapsulation of Non-DNS Traffic
3. DNS Query-Based Tunneling
4. DNS Response-Based Tunneling
5.Needs to look at DNS data to fix the problem.
10. TCP-SYN Floods1. Exploitation of TCP Handshake
2. Exhaustion of Server Resources
3. Spoofed Source IP Addresses
4. Connection Backlog Overflow
5.Often used for hacking and messing up networks.
11.DNS Attack Mitigation 1. Limiting the rate
2. Add-ons for Domain Name System Security
3. Anycast Router
4. Proxy and DNS Filtering
5. Putting together threat intelligence

1. DNS Cache Poisoning Attack

DNS Cache Poisoning Attack

Cache poisoning is one of the most common attacks on the web and is designed to trick users into visiting fraudulent sites when they visit legitimate ones, such as when someone visits gmail.com to check their email.

In addition, the DNS is becoming poisoned, such that rather than the gmail.com page being displayed, a scam website selected by the criminal is shown instead, for example, to regain access to the victim’s email account.

Therefore, users who type in the proper domain name will be tricked into visiting a fraudulent website.

To put it simply, it creates a fantastic opportunity for hackers to utilize phishing techniques to steal information, either personal or financial, from naive victims.

The severity of the attack and the damage done by DNS poisoning depends on a number of variables.


  • DNS caches are a way for DNS resolvers to temporarily store the IP addresses that go with domain names.
  • An attacker uses a DNS cache poisoning attack to pretend to be a real DNS server by sending fake DNS answers to a DNS resolver or a target device.
  • The intruder tries to get fake DNS records into the DNS cache of the target.
  • DNS messages have a transaction ID that helps match responses to requests that are linked to them.
What is Good ?What Could Be Better ?
DNS Cache Poisoning AttackIllegal and Unethical
Stealthy AttackDisruption of Services
Impact on a Wide Range of UsersPotential for Collateral Damage

DNS Cache Poisoning Attack Trial / Demo

2. Distributed Reflection Denial of Service

Distributed Reflection Denial of Service (DRDoS)

The goal of a distributed reflective denial of service (DRDoS) attack is to flood a target with so many UDP acknowledgments that it becomes unavailable.

Attackers have been known to move DNS, NTP, etc. records in some cases.

They require a spoofed source IP in order to credit the host that actually operates at the faked address with a larger amount of acknowledgment.

UDP is the protocol of different alternatives for this sort of attack, as it does not build a connection state.

Assume, for the sake of argument, that a TCP connection terminated as soon as the SYN/ACK packet disappeared due to an IP address spoofing attack.

When these attacks are controlled at the right scale, the concept of collective reflection becomes obvious; this results in multiple endpoints broadcasting faked UDP offers, generating acknowledgments that will be directed at a single target.

When these reaction packs start showing up, the target becomes unavailable.

How to Prevent?

After a distributed denial of service (DDoS) attack has begun, it is far more difficult for a company to respond effectively.

While it is impossible to completely prevent DDoS assaults, there are measures that may be taken to make it more difficult for an attacker to render a network inaccessible.

The following steps will help you to scatter organizational assets to bypass performing a single deep target to an attacker.

  • First, locate servers in different data centers.
  • Assure that your data centers are located on various networks.
  • Make sure that data centers have several paths.
  • Make sure that the data centers, or the networks that the data centers are related to, have no essential security holes or single points of failure.

For a company that relies on servers and Internet ports, for them, it is vital to make sure that devices are geographically spread and not placed in a particular data center.

In addition, if the resources are already spread out, it is crucial to check that not all data stations are connected to the same internet provider and that each data station has multiple channels to the internet.


  • DDoS attacks take advantage of network protocols that let a small request lead to an answer that is much bigger than the request itself.
  • Attack traffic is not sent straight from the attacker to the victim. Instead, they send requests to servers or devices on the internet that are weak, which react with more traffic.
  • A botnet is a group of computers or Internet of Things (IoT) that have been hacked and are controlled by the offender.
  • They are often used to launch DDoS attacks.
  • A botnet is a network of computers or the Internet of Things (IoT) that have been hacked and are controlled by the attacker.
  • It is often used to launch DDoS attacks.
What is Good ?What Could Be Better ?
Amplification EffectLegal Consequences
Difficulty in AttributionCollateral Damage
Wide ImpactIncreased Awareness and Mitigation Measures
Wide ImpactReputation Damage

Distributed Reflection Denial of Service – Trial / Demo

3. DNS Hijacking

DNS Hijacking

By using a technique known as “DNS hijacking,” an individual can be redirected to an untrustworthy DNS.

Malicious malware or illegal server modifications may be used to do this, though.

In the meantime, the person has control of the DNS and can direct those who gain it to a website that looks identical but provides additional material, such as adverts.

They may also direct consumers to malicious websites or alternative search engines.

How to Prevent?

A DNS name server is a compassionate foundation that needs necessary protection measures because it can be hijacked and used by several hackers to raise DDoS attacks on others, thus, here we have mentioned some prevention of DNS hijacking.

  • See for resolvers on your network.
  • Critically restrict access to a name server.
  • Utilize measures against cache poisoning.
  • Instantly patch known vulnerabilities.
  • Separate the authoritative name server from the resolver.
  • Restrain zone alterations.


  • The attacker changes a domain’s DNS records by getting into DNS servers or management interfaces without permission.
  • DNS hacking can be used to trick people into visiting fake websites that look a lot like real ones.
  • Attackers can send people to websites that are malicious or house exploit kits.
  • In some DNS hijacking attacks, official DNS servers or the DNS resolvers of Internet service providers (ISPs) are hacked.
What is Good ?What Could Be Better ?
Traffic DiversionIllegal and Unethical
Stealthy AttackTrust and Reputation Loss
Targeted AttacksDisruption of Services

DNS HijackingTrial / Demo

4. Phantom domain attack

Attacks from a phantom domain are similar to those from a casual subdomain.

Because these “phantom” domains never respond to DNS queries, the attackers in this type of assault overwhelm your DNS resolver and drain its resources looking for them.

The goal of this attack is to cause the DNS resolver server to wait for an excessive amount of time before giving up or giving a poor response, both of which are bad for DNS performance.

How to Prevent?

To identify phantom domain attacks, you can analyze your log messages. Moreover, you can also follow the steps that we have mentioned below to mitigate this attack.

  • First, increase the number of recursive clients.
  • Use a proper sequence of the following parameters to gain optimum results.
  • Restrict recursive queries per server and Restrict recursive inquiries per zone.
  • Empower to hold down for non-responsive servers and Check recursive queries per zone.

When you allow any of the options, the failure values are set at an excellent level for overall operations.

However, you should keep the default charges while using these commands, moreover, it guarantees that you know the consequences if you want to replace the default values.

What is Good ?What Could Be Better ?
Social engineeringCountermeasures
PersistenceReputational damage

Phantom domain attack Trial / Demo

5. DNS Flood Attack

DNS Flood Attack

One of the most common forms of DNS attacks is a Distributed Denial of Service (DDoS) that targets your domain name system (DNS).

All the treated DNS zones affect the function of resource records, which is why the main goal of this form of DNS flood is to completely overload your server so that it can’t continue serving DNS requests.

Since this type of attack often originates from a single IP, it is simple to mitigate.

When a DDoS involves hundreds or thousands of people, however, things might get tricky.

The approach of mitigation can be tricky at times since many inquiries will be quickly identified as malicious bugs, and many valid requests will be made to confuse defense equipment.

How to Prevent?

Distributed denial of service (DDoS) attacks have begun to focus on the Domain Name System (DNS).

Any domain information stored in a DNS that is the target of a Distributed Denial of Service (DDoS) flood attack becomes unavailable.

As a result, we’ve developed a strategy for dealing with these kinds of attacks that involves updating old information on a regular basis and keeping track of the domain names that get the most queries across many DNS providers.

Therefore, the results of our simulations indicate that our approach can successfully process over 70% of the total cache replies even under the most severe DNS Flood assault conditions.


  • Attacks called DNS flood try to damage DNS servers or systems by sending them a huge number of DNS requests all at once.
  • It is possible to do DNS flood attacks with both the User Datagram Protocol and the Transmission Control Protocol
  • The User Datagram Protocol and the Transmission Control Protocol can both be used to do DNS flood attacks.
  • DNS flood attacks can increase the amount of data they send by using DNS resolvers or authoritative DNS servers that are not secure.
What is Good ?What Could Be Better ?
High traffic volumeLegal and ethical consequences
Amplification effectService disruption for legitimate users
Reflection and spoofingReputational damage

DNS Flood AttackTrial / Demo

6. Random Subdomain Attack

While not the most common form of DNS attack, it does occur on occasion across a number of networks.

Because their construction follows the same purpose as simple DoS, random subdomain attacks are often characterized as DoS attacks.

Just in case spoilers start bombarding a perfectly good and functioning domain with DNS requests, we’ve got you covered.

However, the main domain name will not be the focus of the inquiries, but rather, many dead subdomains.

The goal of this assault is to create a denial-of-service (DoS) that will overwhelm the official DNS server that is responsible for handling the primary domain name, hence preventing any DNS record lookups from taking place.

The searches will originate from infected people who are unaware they are sending particular types of queries, from what are finally genuine PCs, making this an assault that is difficult to identify.

How to Prevent?

Thus we have provided you a simple method for preventing the random subdomain attack only in a 30-minute.

  • In the beginning, you have to learn the techniques to mitigate the attacks that generate extreme traffic on resolvers and web resources that are connected with the victim the names that can be taken down.
  • Next, Hear about modern capabilities like Response Rate Limiting for preserving DNS experts that provoke attacks.


  • An attacker can make a huge number of subdomains on the spot with a random subdomain attack.
  • As part of the fast flux method, the attacker changes the IP addresses that are linked to subdomains very quickly.
  • Attackers use DGAs to make a lot of domain names or subdomains that look like they were chosen at random.
  • In random subdomain attacks, subdomains that are made at random may host malware or other harmful content.
What is Good ?What Could Be Better ?
Evasion of security controlsLimited impact
Increased attack surfaceCountermeasures
Social engineering opportunities

Random Subdomain Attack Trial /Demo

7. Botnet-based Attacks

Botnet-based Attacks

To be more specific, a botnet is a collection of compromised Internet-connected devices that can be used to launch a coordinated denial-of-service attack, during which the compromised devices can be used to steal information, send out spam, and grant the attacker full control over the compromised device and its network connection.

In addition, botnets are dynamic dangers; as our reliance on digital gadgets, the internet, and future technology grows, so too will the sophistication of these attacks.

This paper investigates the description and organization of a botnet, its creation, and use, with the assumption that botnets can be seen as attacks and as programs for future attacks.

How to Prevent?

This is one of the frequent DNS attacks that have been faced by the victims every day, thus to mitigate these types of attacks, we have mentioned below a few steps so that it will be helpful for you.

  • First, understand your vulnerabilities properly.
  • Next, secure the IoT devices.
  • Identify both your mitigation myths from facts.
  • Discover, classify, and control.


  • When a lot of computers get software like bots or zombies, they join together to form a botnet.
  • The botnet is run by a central Command and Control computer that is usually kept up by the attacker.
  • Attackers can use botnets to launch coordinated strikes from different places by controlling the actions of many hacked devices at the same time.
  • Distributed Denial of Service (DDoS) attacks often use botnets to start them.
What is Good ?What Could Be Better ?
Distributed PowerIllegal and Unethical
AnonymityPrivacy Violations
Resource AvailabilityDetection and Mitigation

Botnet-based AttacksTrial / Demo

8. Domain Hijacking

Domain Hijacking

In this kind of assault, the attacker modifies your domain registrar and DNS servers in order to reroute your traffic elsewhere.

Many factors revolve around an attacker taking advantage of a security hole in a domain registrar’s system, however domain hijacking can also occur at the DNS level if an attacker gains control of your DNS data.

Therefore, when an attacker takes control of your domain name, they can use it to launch attacks, such as setting up a phony page for payment systems like PayPal, Visa, or bank systems.

In order to steal sensitive information like email addresses and passwords, attackers will create a fake website that looks and acts just like the original.

How to Prevent?

Thus you can simply mitigate the domain hijacking by practicing a few steps that we have mentioned below.

  • Upgrade your DNS in the application foundation.
  • Use DNSSEC.
  • Secure access.
  • Client lock.


  • Domain hacking is when someone illegally takes over ownership of a domain name from the rightful owner.
  • If an attacker takes over the name, they can change how the DNS is set up for it.
  • Attackers may add new subdomains or change current ones to make their bad actions more effective.
  • Getting illegal access to the name’s email accounts is another part of domain hijacking.
What is Good ?What Could Be Better ?
Control over the domainLoss of control and reputation
Identity theft and fraudDisruption of services
Financial gainLegal consequences

Domain HijackingTrial / Demo

9. DNS tunneling

DNS tunneling

This cyberattack makes use of the DNS acknowledgment and query channels to transmit encoded data from several apps.

While it was never intended for widespread usage, this technology is now routinely employed in assaults because of its ability to circumvent interface safeguards.

Intruders need physical access to a target system, a domain name, and a DNS authoritative server in order to conduct DNS tunneling.

How to Prevent?

To configure the firewall to identify and block DNS tunneling by designing an application rule that uses some protocol object, we have mentioned three steps to mitigate these types of attacks.

  • Create an access rule.
  • Create a protocol object.
  • Create an application rule.


  • Tunneling in the Domain Name System entails hiding information that isn’t part of a DNS query or answer.
  • DNS tunneling exploits the DNS protocol, which is primarily used for domain name resolving, for reasons other than those intended.
  • Using DNS tunneling, secret routes of communication can be established within regular DNS traffic.
  • Extraction of private data from a compromised network or system is possible through DNS tunneling.
What is Good ?What Could Be Better ?
Evasion of network security controlsDetection challenges
ConcealmentIncreased attack surface
Protocol versatilityNetwork performance impact

DNS tunnelingTrial / Demo

10. TCP SYN Floods

TCP SYN Floods

A simple Denial-of-Service (DDoS) attack, a SYN Flood can disrupt any service that uses the Transmission Control Protocol (TCP) to communicate over the internet.

Common infrastructure components like load balancers, firewalls, Intrusion Prevention Systems (IPS), and utilization servers can be vulnerable to SYN waves, a form of TCP State-Exhaustion attack that attempts to exploit the connection element tables included in these components.

Therefore, even high-capacity equipment designed to manage millions of links can be brought down by this kind of attack.

Additionally, a TCP SYN flood attack is when an attacker sends an overwhelming number of SYN queries to a system in an effort to crash it and render it unable to respond to new genuine connection offers.

As a result, it promotes a condition in which all information ports on the target server are partially open.

How to Prevent?

Firewalls and intrusion prevention systems (IPS), while crucial, are not enough to prevent complicated DDoS attacks.

The increasingly complex nature of attacks necessitates a holistic solution that goes beyond basic network upkeep and internet connectivity.

Thus there are some capabilities that you can count for more powerful DDoS security and faster mitigation of TCP SYN flood attacks.

  • At first, provide proper support to both inline and out-of-band deployment to ensure that there is not only one single point of collapse on the network.
  • Extensive network distinctness with the capacity to see and examine traffic from various parts of the network.
  • Different sources of threat intelligence, including statistical exception detection, customizable entrance alerts, and fingerprints of known threats assure fast and reliable detection.

Extensible to handle attacks of all sizes, extending from low-end to high-end and high-end to low-end.


  • There are three steps in the TCP handshake: SYN, SYN-ACK, and ACK.
  • They send a lot of SYN (synchronize) packets to the target server while saying they want to start new connections.
  • The targeted server gives out system resources, like RAM and details about the connection state, for each incoming SYN packet.
  • Spoofing the original IP addresses in SYN packets is something the attacker does a lot to make it harder to find and stop.
  • It keeps too many half-open links, which puts too much stress on the targeted system’s memory, CPU, and connection status tables.
What is Good ?What Could Be Better ?
Effective at disrupting servicesRisk of collateral damage
Simple implementationPotential legal consequences
Difficult to mitigateReputational damage

TCP SYN Floods Trial / Demo

11. DNS Attack Mitigation

As per the information, there are numerous forms to solve or to prevent this attack.

For starters, the IT teams should configure DNS servers to rely as minimal as possible on trust relations with other DNS servers.

Doing so will make it harder for attackers to practice debasing target servers via DNS servers.

The DNS name servers should also be configured by IT teams to prevent cache poisoning attacks via:-

To put limits on deeply nested queries.

To only save information that pertains to the specified domain.

For queries to return only the specified domain-specific data.

In addition, there are a few cache poisoning techniques available to aid institutions in halting poisoning outbreaks.

DNSSEC (Domain Name System Security Extension), developed by the Internet Engineering Task Force, is the most well-known solution for preventing cache poisoning since it offers trustworthy DNS data authentication.


  • DNSSEC is a group of DNS extensions that adds cryptographic security to DNS results.
  • Through source port randomness, DNS servers can pick any source port for DNS requests.
  • Some DNS servers use source port randomness to pick a different source port for each DNS request.
  • Response rate limiting is a way for DNS servers to find and stop DNS query floods.
What is Good ?What Could Be Better ?
DNS Attack Mitigation – Cache poisoning Reduced Disruption and Downtime
Data IntegrityPotential Performance Impact
Enhanced Trust and ReputationOperational Overhead

DNS Attack Mitigation Trial / Demo


As you see, DNS service is essential for preserving your companies’ websites and online assistance working day-to-day.

Thus if you’re looking for methods to evade these kinds of DNS attacks, then this post will be helpful for you.

So, what do you think about this? Simply share all your views and thoughts in the comment section below.

And if you liked this post then simply do not forget to share this post with your friends and family.

Work done by a Team Of Security Experts from Cyber Writes (www.cyberwrites.com) - World’s First Dedicated Content-as-a-Service (CaaS) Platform for Cybersecurity. For Exclusive Cyber Security Contents, Reach at: [email protected]