What does a Trojan virus look like? What is a Trojan horse? Amavaldo banking trojan uses screenshots to steal information

A Trojan virus or simply a “Trojan” is correctly called a Trojan program. A Trojan is a type of malicious software designed to degrade a computer's performance until it completely fails. Sometimes Trojan horses are also called Trojan horses. The name “Trojan” is associated with ancient warriors who previously lived in the country of ancient Troy and have been extinct for three centuries. However, the inhabitants themselves were called Teucrians. They could quickly and powerfully strike their opponents with their swords. Many have heard the name " Trojan horse" If you believe the legends, this is not a living horse under the command of the Teucrians, but a specially built huge horse during the time of the great Trojan warrior.

The very name of the Trojan virus comes from this same Trojan horse - their attack methods are almost identical. The legends say that it was because of the Trojan horse that Troy fell. As mentioned above, the Trojan program uses the same goals - first it penetrates the computer and then tries to disable it, legally transfer information to another person, disrupt the computer's performance, or use computer resources for bad purposes.

What kind of Trojans are there?

There are many names. Trojan. Malware, Trojan. Winlock, Pinch, TDL – 4. Strictly speaking, Trojan are not viruses themselves, but a family of them, which already includes the viruses themselves. But TDL-4 is already a program.

The goal of TDL-4 is to defeat a computer, after which another user can control the infected computer using the Internet. The similarity of the action is reminiscent of the Team Viewer program, but unlike TDL - 4, this program is completely legal and the user can see on the monitor what another user is doing at the moment. In addition, if necessary, the connection can be interrupted.

Pinch is a very, very dangerous virus. It works in three stages. First, he goes to the computer and downloads the files he needs for work. The size of the virus does not exceed 25 KB. Next, Pinch collects absolutely all the information about the user’s computer - where the files are stored, what the user’s video card, sound card and processor power are. It also collects information about installed browsers, antiviruses, a list of installed programs and data about the user’s FTP client. All this happens unnoticed. After collecting information, Pinch itself is packaged into an archive and attached to it upon the first letter. During the transmission of the letter, Pinch is separated, heading towards the hacker's computer. Afterwards, the hacker can decrypt the information using the Parser program and subsequently use this information for his own purposes.

In addition to Trojans and worms, there are several other classifications of malicious software (software), for example rootkits. Their goal is to seize administrator rights on the user’s computer and then use them for their own purposes.

How to get rid of Trojans?

In the same way as for all viruses, scan your computer for viruses. However, not every antivirus sees absolutely all viruses. Sometimes, in order for the antivirus not to find the “antivirus”, it is enough just to change its name and standard location on the hard drive. Therefore, smart developers came up with antiviruses specially created for a certain type of virus. Antiviruses can detect and deal with many worms on a computer, but are completely useless against rootkits and vice versa.

The leading fighters against Trojans and other malware are: Kaspersky Anti-Virus, Dr.Web, Eset(Nod32). Paid versions of which can be purchased.

One of the biggest troubles for an Internet user is a “Trojan horse” - a virus that is spread on the network by attackers. And although antivirus software developers are constantly modifying their programs to make them more reliable, the problem still remains, because hackers are not sitting still either.

After reading this article, you will learn how to protect your computer from penetration by a Trojan, and also learn how to remove this virus if it does end up on your device.

What is a Trojan horse?

The name of this virus is taken from a legend that says that the Greeks made wooden horse, inside which wars hid.

This structure was then taken to the gates of Troy (hence the name), supposedly as a sign of reconciliation. At night, Greek soldiers opened the gates of the enemy city and inflicted a crushing defeat on the enemy.

A computer virus works in a similar way. A Trojan horse is often disguised by attackers as a regular program, which, when downloaded, introduces malware onto your computer.

This virus differs from others in that it does not reproduce spontaneously, but gets to you as a result of a hacker attack. In most cases, you download a Trojan onto your device without knowing it.

A Trojan horse is a virus that can cause a lot of trouble to the user. Read on to find out what the consequences may be.

Signs of infection

If your computer was attacked by a Trojan, you can find out about it by the following changes in your computer:

Firstly, the device will start rebooting without your command.
Secondly, when a Trojan horse penetrates a computer, the performance of the device is significantly reduced.
Thirdly, spam is sent from your email inbox.
Fourthly, unknown windows open with pornography or advertising of a product.
Fifthly, operating system does not start, and if the download is successful, a window appears asking you to transfer money to the specified account to unlock the system.

In addition to all the above problems, there is another one - the loss of money from an electronic wallet or confidential information. If you notice that this has happened to you, then after removing the Trojan, you need to immediately change all passwords.

Trojan horse (virus). How to remove it from your computer?

Of course, the penetration of a Trojan horse can cause significant harm to the user (for example, financially), but since this is a fairly common type of virus, you can get rid of it using any popular antivirus (Kaspersky, Avast, Avira etc.).

If you suspect that your computer is being attacked by a Trojan, boot the device in Safe Mode and scan the system with an antivirus program. Quarantine any detected malware or remove it immediately. After that, open the “Programs and Features” section and get rid of suspicious applications that you did not install.

Sometimes the antivirus program is blocked by a Trojan horse. This virus is constantly being modernized, so situations like this happen. In this case, you can use one of the special utilities, for example SuperAntiSpyware or Spyware Terminator. In general, find a program that suits you, and then use it to remove the Trojan.

Conclusion

So now you know what a Trojan horse is. You can remove the virus discussed in this article yourself if it gets onto your computer.

Of course, it is better that such trouble does not happen to you, but for this you need to install a good antivirus program, regularly update its database, carefully monitor program warnings, and also not visit or download anything from suspicious resources.

Before unpacking any downloaded archive, be sure to scan it with an antivirus. Also check the flash drives - there should be no hidden files on them. Remember: a Trojan can cause a lot of problems, so take all measures to identify it responsibly.

The modern virtual world, with its daily increasing volume of information exchange and electronic payments, has long been favored by criminals. One of the ways cybercriminals make money is by distributing Trojan programs. We’ll talk about what it is and how hackers earn millions in profits with the help of Trojans in this article.

So, a Trojan is a small program disguised as harmless software. This disguise allows it to enter the computer without hindrance from the user or antivirus program for the malicious actions for which it was created. The name “Trojan program” (Trojan, Trojan, Trojan virus) comes from the legendary “Trojan Horse”, with the help of which Odysseus’s wars got inside Troy.

Trojan horse may contain both viruses and worms, but unlike them, it does not spread on its own, there is a person behind it. Of course, it is very rare for a hacker to download a Trojan onto your computer himself. More often than not, it encourages users to download malware onto their computer. How does this happen? The cybercriminal uploads a Trojan program to visited sites, file hosting services and other resources. From there, for various reasons, users download the Trojan onto their computer, infecting it.

Another way to “put a Trojan horse” on your computer is to read spam mailings. Typically, a PC user automatically clicks on attached files in emails. Double click and the Trojan program is installed on your computer.

There are several types of Trojan programs:

Trojan-PSW (Password-Stealing-Ware)– a type of Trojan program that steals passwords and sends them to the virus distributor. The code of such a Trojan contains an e-mail address to which the program sends passwords and phone numbers read from the computer. credit cards, telephone numbers and other information. In addition, another target of Trojan-PSW is codes for online games and registration codes for licensed programs.

Trojan-Clicker– a type of Trojan program that performs unauthorized redirection of users to an Internet resource desired by a cybercriminal. This is done to achieve one of three goals: a DDoS attack on a selected server, increasing visitors to a given site, or attracting new victims for infection with viruses, worms or other Trojans.

Trojan-Downloader And Trojan-Dropper– malware with a similar effect. Trojan-Downloader, as the name suggests, downloads infected programs to the PC, and Trojan-Dropper installs them.

Trojan-Proxy– Trojan proxy servers. These programs are used by attackers to secretly send spam.

Trojan-Spy– spyware. The purpose of such Trojan programs is to spy on a PC user. The Trojan takes screenshots of the screen, remembers information entered from the keyboard, etc. These programs are used to obtain data on electronic payments and other financial transactions.

ArcBomb– archives that interfere with the correct operation of the computer. They fill HDD a large amount of duplicate data or empty files, which causes the system to freeze. Hackers use ArcBomb to slow down or stop mail servers.

Rootkit– program code that allows you to hide the presence of a Trojan program in the system. Rootkit without a Trojan is harmless, but together with it it carries a significant danger.

Trojan Notifier– a Trojan program that sends a notification to the creator about a successful attack on the user’s computer.

Cybercriminals unite several computers infected with Trojans into botnets - networks of computers controlled by hackers. Such botnets are a great danger to users. With their help, cybercriminals send spam and steal passwords bank accounts, carry out DDoS attacks. Now imagine that one of the computers united in a botnet is yours. Moreover, you will not know anything about this until one “fine” day the police from the cybercrime department knock on your door. Then prove that it was not you who DDoS or the server that was attacked, but a hacker who had access to your system using a Trojan.

In order to minimize (namely, minimize, cannot be avoided) the consequences of infection of your home computer, install a licensed anti-virus program that will update its databases. The creators of anti-virus programs are always several steps behind hackers, so databases should be updated as often as possible. If your computer has become infected with a virus, then it needs computer help. We advise you to contact the best service in the city of Kemerovo.

The development of malware requires resources no less, or even several times more, than the development of software needed for operation. Trojans are a simple and, most importantly, cheap method used by hackers to remotely control your software. The fight against Trojans must reach new level, otherwise the creators of antiviruses will not be able to cope with the growing force of cybercrime on their own.

Hello admin! I worked without an antivirus for two weeks, I didn’t surf the Internet much during this time, but today I installed an antivirus and it found three Trojan programs during scanning! Could they have done something in such a short period of time on my operating system?

Trojan programs: educational program

A separate type of malware is called Trojan because of comparison with the Trojan horse, which, according to ancient Greek mythology, was given to the inhabitants of Troy by the Greeks. Greek soldiers were hiding inside the Trojan horse. At night they came out of hiding, killed the Trojan guards and opened the city gates to the rest of the military force.

What is the essence of Trojan programs?

A Trojan program, also known as a Trojan, also known as a Trojan, is a type of malware that differs from classical viruses that independently infiltrate a computer, multiply there and multiply by participating in the activation process of a human user. Trojan programs, as a rule, are not able to spread themselves, as viruses or network worms do. Trojan programs can disguise themselves as various types of files – installers, documents, multimedia files. The user, by launching the file under which the Trojan disguises itself, launches the Trojan itself. Trojan programs can be registered in the system registry and activated during Windows startup. Trojans are sometimes virus modules.

How can you pick up a Trojan program?

Installers of programs or games are often equipped with Trojans, and then they are posted on low-quality file hosting services, Varez sites and other less-than-ideal software portals for mass downloading by Internet users. You can also pick up a Trojan program by mail, online messengers, social networks and other sites.

Friends, now I will show you how you can download a real Trojan. For example, you decided to download it for yourself, typed the appropriate request in your browser and got to this site, naturally click Download

And instead of Windows, we are blatantly given to download a Trojan, the download of which is interrupted by my anti-virus program. Be careful.

The scenario for introducing Trojans can be different. These are requests to download some additional software - codecs, flash players, browsers, various updates for web applications, naturally, not from their official websites. For example, while surfing the Internet, you may come across such a warning, which again hides a Trojan program. Please note that there is even a spelling error on the banner.

These are links from unknown users that you are actively persuaded to follow. However, an “infected” link on a social network, Skype, ICQ or other messenger can be sent by a familiar user, although he himself will not even suspect it, since the Trojan will do it instead of him. You can catch a Trojan by succumbing to any other tricks of its distributor, whose goal is to force you to download a malicious file from the Internet and run it on your computer.

This is what a live Trojan might look like, I just caught it yesterday on a friend’s computer, maybe the friend thought that he had downloaded the free antivirus Norton Antivirus 2014. If you run this “antivirus”, then

Windows desktop will be locked!

Signs of a Trojan on your computer

This may indicate that a Trojan program has entered your computer. various signs. For example, the computer itself reboots, turns off, launches some programs or system services on its own, and opens and closes the CD-ROM console on its own. The browser itself can load web pages that you have not even visited before. In most cases, these are various porn sites or gaming portals. Spontaneous downloading of porn - videos or pictures - is also a sign that a Trojan is already at work on the computer. Spontaneous flashes of the screen, and sometimes also accompanied by clicks, as happens when taking screenshots - a clear sign that you have become a victim of a spyware Trojan. The presence of Trojan software in the system can also be indicated by new, previously unknown to you, applications in startup.

But Trojan programs do not always work, impersonating themselves, and their signs are not always obvious. In such cases, it is much easier for users of low-power computer devices than for owners of high-performance machines. If a Trojan penetrates, the first ones will be able to observe a sharp decline in performance. This is usually 100% CPU, RAM or disk utilization, but no user programs are active. And in the Windows Task Manager, almost all computer resources will be used by an unknown process.

For what purposes are Trojan programs created?

Theft of user data

Wallet numbers, bank cards and accounts, logins, passwords, PIN codes and other confidential data of people - all this is of particular commercial interest to the creators of Trojan programs. That is why Internet payment systems and online banking systems try to secure the virtual money of their clients by introducing various security mechanisms. As a rule, such mechanisms are implemented by entering additional codes that are sent via SMS to a mobile phone.

Trojans hunt for more than just data financial systems. The object of theft may be login data for various Internet user accounts. These are accounts social networks, dating sites, Skype, ICQ, as well as other Internet platforms and instant messengers. Having taken over a user's account with the help of a Trojan, scammers can use various money-grabbing schemes on his friends and subscribers - asking for money, offering various services or products. And, for example, scammers can turn the account of some pretty girl into a point of sale of porn materials or redirect them to the necessary porn sites.

To steal people's confidential data, scammers usually create special Trojan software - spyware, also known as Spyware.

Spam

Trojans can be created specifically to collect addresses Email Internet users and then send them spam.

Downloading files and boosting website indicators

File sharing services are far from the most profitable type of income if you do everything honestly. A low-quality website is also not the best The best way win the user audience. To increase the number of downloaded files in the first case and the traffic indicator in the second, you can introduce a Trojan into users’ computers, which, without knowing it, will help scammers improve their financial well-being. Trojan programs will open the desired link or website in the users’ browser.

Stealthy computer control

Not only cheating website indicators or downloading necessary files from file hosting services, but even hacker attacks on the servers of companies and government agencies are carried out with the help of Trojans, which are installers of backdoors. The latter are special programs created for remote control of a computer, naturally, secretly, so that the user does not guess anything and does not sound the alarm.

Data destruction

A particularly dangerous type of Trojan can lead to the destruction of data. And not only. The barbarity of some Trojan programs can result in damage to the hardware components of your computer or network equipment. DDoS attacks - disabling computer equipment - are carried out by hackers, usually to order. For example, to destroy data from competing companies or government agencies. Less commonly, DDoS attacks are an expression of political protest, blackmail or extortion. Novice hackers can practice carrying out DDoS attacks without any particular intent or global purpose in order to become experienced geniuses of evil in the future.