Malicious software is software that aims to create unauthorized access to computer resources or information on a hard drive. Often created to do harm by copying, distorting, deleting, replacing information. Further we will consider how to create a virus-joke, to protect ourselves from viruses.
What is a virus?
Before you create a virus, you need to determine exactly what it is. For a program to be considered malicious, it must:
- destroy information or disrupt the computer;
- run without warning;
- have the explicit purpose of unauthorized access or destruction of information.
Computer viruses must meet all of the above criteria. For example, a copy protection cracker is not a malicious program. It does not destroy files, but only selects a password to unlock. Also, a disk formatting program cannot be considered malicious. It destroys data on the computer, but is performed with the consent of the user. If a program destroys information due to internal errors, it is also not considered a virus. Although developers may be responsible for neglecting work or as violators of consumer rights, the program could delete important data. In general, clear criteria have not yet been determined. In order for the program to be considered a virus, software and hardware expertise is carried out.
Types of viruses
Why create viruses? There are many reasons. One part of the malicious files is really dangerous and can damage the health of the machine, the other is harmful indirectly. List of main goals:
- Destabilization.
- Installing other malware.
- Theft, fraud, espionage.
- Adware.
- Misc.
Computer viruses interfere, it can be a causeless opening and closing of a drive, hardware failure.
Some programs behave quite cunningly. Downloading media from an infected link may result in malware downloading.
To steal any information, a hard disk scan, registration of keystrokes, and redirection of a user to a fake site are used. So, accounts are stolen and used to send spam, payment systems are hacked, computers are blocked to extort money. This is sometimes paid software that, after downloading, does nothing useful.
Due to the damaged file, a public proxy server can be organized on the computer, the machine will become a member of the botnet and will be used to conduct DDOS attacks. With the popularization of Bitcoin, cases of hidden mining on users' PCs have become more frequent.
There are also programs that show ads or collect various information for marketing purposes.
How to create viruses
In Notepad (or rather, in any text editor), you can create a malicious program, and you can do this in the same way as ordinary programs create. Any programming languages are used. Usually, this is C ++, but it can be Delphi and .Net. The goal of creating a virus can be a joke or an introduction to how it works. How to make a joke virus? A simple program is written right in Notepad, and the code itself takes up very few lines.
You can completely eliminate the virus from entering the computer provided that you disconnect the Internet and refuse to use illegal software. Files containing viruses can function without an internet connection. In this case, they will harm the information on the user's hard drive or cause the program to work incorrectly.
Today, the main goal of hackers is not the development of destructive programs that clearly harm the system, but the creation of products that behave quietly. They can work for a long time and at one point cause very serious harm.
Signs of infection
Before creating a virus, attackers analyze all the ways in which it can be detected, try to get around them. Antiviruses effectively detect malicious files, but by mistake of a user, some of them can be added to exceptions. In order to react in time that the computer is infected, you need to track suspicious and strange actions.
The most obvious signs of infection:
- opening windows with unfamiliar content;
- blocking access to sites;
- third-party processes in the "Task Manager";
- new entries in startup;
- the inability to make changes to the computer settings;
- accidentally restarting the computer or shutting down.
Some of the symptoms can be caused by a joke virus and do not pose a clear threat to the system. And some of them are used to divert attention, while the main virus collects user data.
Virus spread
The attack has several stages. The first answers the question of how to create a virus, that is, this is a technological stage. The second is the delivery of malware to the computer. The main methods of spreading viruses:
- exploit exploits vulnerabilities in software, with the help of which it takes control of the system and disrupts its functioning;
- a logical bomb fires under a certain condition, it is inseparable from the host program into which it is integrated;
- a trojan program penetrates a computer under the guise of legal software, very often it is part of an entire planned multi-stage attack;
- worms spread independently through local and global networks; for this, errors in administration are used, as well as social engineering tools.
Prevention and treatment
There are antiviruses to protect against viruses. They qualitatively protect the system, but, as a rule, the user himself is to blame for the infection of the system. Therefore, you need:
- Install updates in a timely manner, use licensed copies;
- run on a computer as a user, not an administrator;
- open computer files only from trusted sources;
- use a firewall.
How to make a joke virus
A virus is primarily a program that modifies the contents of any files. It is created in the same way as any other program. The simplest malware options can be created in Notepad. This does not require special skills or knowledge of programming languages.
How to create viruses in Notepad?
The following lines will create 1000 folders in one second, which will put the user in a stupor:
@ECHO off
: top
md% random%
goto top
Now you need to save the document with the extension .bat. The program does not have to be written in Notepad, the commands can be written on the command line and simply saved to the appropriate file.
How to create a virus to steal passwords? It is already more difficult to answer this question. To do this, you need to consider how the user will launch the malicious file, how the data will be stolen. Only then can we start implementation. This is a very complex process. In addition, this may be illegal, so we do not recommend readers to create viruses for any purpose (except, of course, educational).