What is a backdoor What are the common types of backdoors, and what are their characteristics

Intrusion from an open port program!

There are many types of backdoors, including web page doors, thread insertion backdoors, and extended backdoors. Backdoors can be used by different hackers, some to crack passwords, some to access the system, some to modify system permissions, and some to plant Trojans and control the system.

It is convenient to modify the defects of the program design. However, if the backdoor program is known by hackers, it will pose a security risk to users, and hackers can use it to collect information to hack into users' computers. Backdoors can bypass the system's intrinsic security protections to attack and defeat the system's security settings.

Principle: A backdoor program is a way to remain in the computer system for a special user to control the computer system in a special way.

Backdoors, as we usually call them"Trojans"There are connections and differences. The connection lies in the fact that they are all hidden in the user's system to send information to the outside world, and they themselves have certain permissions to allow the remote machine to control the machine.

The difference is that a Trojan is a complete piece of software, while a backdoor is smaller and has a single function. The backdoor is similar to a Trojan horse (abbreviated"Trojans"), which is used to infiltrate a computer to collect information or facilitate hacker access.

The biggest difference between a backdoor program and a computer virus is that the backdoor program does not necessarily have a self-replicating action, that is, the backdoor program does not necessarily "infect" other computers.

A backdoor is a method of logging into a system that not only bypasses the security settings already in place on the system, but also frustrates various enhanced security settings on the system.

Moreover, in virus naming, backdoors are generally marked with the word backdoor, while Trojans are generally written with the word trojan.

A worm is a virus that destroys a program, mainly destroying all your files without harming your hardware.

The backdoor is a kind of Trojan horse, and the Trojan horse, as the name suggests, is to lurk in your program and steal your information and password through your program.

In the field of information security, a backdoor is a method of bypassing security controls to gain access to a program or system. The main purpose of the back door is to facilitate secret access or control system again in the future.

Attackers use spoofing methods to send emails or files and trick the host's operators into opening or running messages or files containing Trojans, which create a backdoor on the host.

After an attacker compromises a host and gains control of it, they can set up a backdoor on the host, such as installing a Trojan horse, so that it can be used in the next intrusion.

There is also a type of backdoor that is introduced during the software development process. In the development stage of software, programmers often create backdoors in the software to facilitate testing or modification of defects in the program, but when the software is released, the backdoor is intentionally or unintentionally ignored and not deleted, then the software is born with a backdoor, and the host that installs the software will inevitably introduce the backdoor.

Most intruders' backdoors fulfill the following purposes:

Even if an administrator improves security by changing all passwords, for example, they can still break in again, minimizing the possibility of another breach being discovered.

The introduction of backdoors will undoubtedly pose a significant security risk. Those who know the backdoor can have covert access and control of the system in the future, and the backdoor is also easy for intruders to attack as a vulnerability.

Extraction code: z0g5 During the development phase of the software, programmers often create backdoors within the software so that defects in the program can be modified. If a backdoor is known to others, or if it is not removed before the software is released, then it becomes a security risk.

The back door is also called the back door - a computer has a total of 65536 ports from 0 to 65535, so if the computer is regarded as a room, then these 65536 ports can be regarded as the 65536 doors opened by the computer to connect with the outside world. Why do you need so many doors? Because the master was very busy, in order to deal with many socials at the same time, he decided to do only one socializing job at each door.

So some doors are specially opened by the host to welcome guests (to provide services), and some doors are opened by the host to go out to visit guests (access remote services) - theoretically, the rest of the doors should be closed, but for various reasons, some doors are quietly opened without the owner's knowledge. So good deeds entered, the owner's privacy was spied on, life was disturbed, and even the things in the house were messed up. This door was quietly opened - the "back door".

The backdoor of the software is for the creator to do it for his or her own rights. Set up the registration of the software. and so on. Like some software, you have to register the code. But some software doesn't need a registration code.

1. "Backdoor of software" refers to a hacker method that bypasses the security control of the software and obtains no access to the program or system from a relatively secret channel.

2. The role of the software backdoor: in software development, the backdoor can be set to repair and test the defects in the program.

3. The harm of the software backdoor: if the backdoor is not removed before the software is released, or the backdoor is leaked, it will pose a threat to the computer system.

Program Backdoor!

Addition is generally done when writing a program! Add some of the things you need, (usually a Trojan, or click on an ad, or maybe some other program).

The second is to use software that adds backdoors! This software is not available for all software! It's not surprising that it's possible to lose the software! Use with caution.

Real-time protection is enabled, or there is a problem with the backdoor adder itself, or the software to be added to the backdoor is special.