What are PDoS and TDoS attacks and how to protect yourself

by Kelvin
PDoS- и TDoS-атаки и способы защиты

What are denial of service attacks?

First of all we are going to explain what is denial of service attack … This is commonly known as a DDoS attack. As the name suggests, this is basically an attack aimed at a computer with the aim of causing a denial of service and failure.

PDoS and TDoS attacks and methods of protection

This attack can cause the service to stop responding in whole or in part. For example, one might mention web server due to which the page becomes inaccessible to users. The same can happen with any computer system that can leave a company without communication with the outside world or when workers are unable to use computers for normal operation.


This can logically imply large economic losses for the organization. If we go back to the web page example, suppose it has items for sale and the site is blocked for a few hours. During this time, customers can go to other pages of the competition, which will lead to economic losses.

Such an attack can occur by sending a large number of requests flood of the server. This could lead to the inability to provide services and crash. However, there are different methods and other varieties of derivative attacks. Let’s see what two of these flavors consist of: PDoS and TDoS.

What is PDoS Attack

PDoS is persistent denial of service attack … It consists in carrying out hardware sabotage. An attacker blocks the device or completely blocks the firmware without being able to do anything at all. This command stops working and is not only partially compromised.

A victim of a PDoS attack has no choice but to repair this device or even buy a new one. Otherwise, a company or organization that depends on this system will not be able to continue as usual.

An attacker damages the device by maliciously loading BIOS or remote control. They often exploit existing vulnerabilities in device software or a corrupted firmware image.

But, PDoS attacks can also be performed physically. An example is a maliciously configured USB stick. A simple flash drive can hack into a computer and render it unusable.

It should be noted that PDoS attacks mainly computers that can be controlled remotely. For instance, router , to a printer or any another network device … They usually seek to change legal firmware to faulty or malicious, which could cause it to stop working.

Thanks to the malicious firmware they installed, they could control these devices. They can cause them not to work until they are repaired. Sometimes it is enough to reset it and return to factory settings to repair it, but in other cases it can even damage the computer hardware.

Se duplican los ataques DDoS

What is a TDoS attack

Another variety we can find is TDoS attacks … This is a telephony denial-of-service attack. It consists in the fact that an attacker initiates a large number of calls and keeps them active for as long as possible in relation to the destination network. This leads to the fact that they cannot receive legitimate calls, and logically affects the work of a company or organization, not being able to properly serve users.

A characteristic feature of TDoS attacks is that they target not only large companies and corporations, but also small organizations. Over time, they have evolved and become more automated. Attackers create phone campaigns

There were examples of TDoS attacks on very different organizations … You can mention bank call centers, emergency services or the technical service of many companies.

Now, how can an attacker make so many calls at the same time? One of the most common ways is through malware … Malicious software that is downloaded to the phones of many users via social media, fake pages and file downloads. This malware is programmed to automatically call the interrupted number.

Thus, an attacker can simultaneously call from thousands of devices. Even from these devices, it will be possible to call another organization in the future. After all, this malware can be controlled remotely and adapted to whatever it is looking for at any time.

What are PDoS and TDoS attacks and how to protect yourself 2

How to avoid such attacks

We have seen that there are differences in the way these attacks are carried out. However, there are some common references such as vulnerabilities that attackers are always looking for. We’re going to provide some general advice to avoid falling victim to denial of service attacks like PDoS or TDoS and to prevent our hardware from being used to do so.

Keep your hardware up to date

Something fundamental – always have hardware updated correctly … Many vulnerabilities can arise. Cybercriminals can take advantage of the flaws in our systems and devices. Hence, it is important to always have the most recent versions.

Thanks to security patches, we can fix problems. We can prevent an attacker from exploiting these flaws and use our hardware for a denial of service attack such as PDoS or TDoS.

There are security tools

Of course, we should always install security software. Good antivirus can prevent the infiltration of malware that puts the system at risk. We have many options at our disposal, and we must apply them on mobile devices as well as on desktops.

We have seen that in the case of TDoS attacks, the attacker usually installs malware on the devices of many users to automatically make calls. To prevent our mobile phone from participating in this attack, we can install a good antivirus and protect ourselves from this malware.

Analyze network traffic

We must also constantly monitor our network. Analyzing network traffic helps us gain a wide knowledge of what devices are connected, and if at any moment we see something strange, we can paralyze attacks of this type before it’s too late.

Protect networks

Another issue to consider is protect networks … This means using strong and complex passwords on our Wi-Fi, as well as securing the router, updating the firmware and changing various settings that can benefit us and significantly improve security.

Common sense

But without a doubt the most important thing will always be common sense … Avoiding mistakes can save us from becoming victims of denial of service attacks or from participating in a botnet attacking third parties.

For example, it is important to avoid downloading attachments that come to us via e-mail without knowing who is behind it. It would also be a mistake to download software from sites that are unsafe and may contain malware.

Ultimately PDoS and TDoS attacks are two flavors of denial of service attacks. We saw what we can do to protect ourselves and thus prevent our teams from being compromised at any given time.