A trojan (or a trojan horse) is a malicious computer program that is used to infect the target PC system and cause malicious activity on it. Usually, such programs are used for stealing personal information, spreading other viruses or simply disrupting computer's performance. In addition, hackers can use them for getting an unauthorized remote access to a compromised computer, infecting files and damaging the system. As soon as a trojan horse infiltrates computer, it starts hiding from the victim. Trojans are very similar to the regular viruses and, therefore, are quite difficult to detect. That's why you should rely on reputable anti-spyware. Originally, trojans are not intended to spread by themselves. However, the recent versions have additional components that can enable their propagation. The activity of each of trojan horse depends on its author’s intentions.
One part of trojans are able to propagate themselves and infect the system without users' knowledge. Others must be manually installed on computer as any other software. In fact, there are five major ways used by such parasites for entering the system.
The most of trojan horses are capable of causing such activity:
There are thousands of different trojans. The following examples illustrate how harmful these threats can be.
Trojan.Cryptolocker is a trojan, which has been used for spreading very dangerous viruses called Cryptolocker and Cryptowall. It is believed that this trojan can also be used for the distribution of other malware, such as rogue anti-spyware programs, backdoors and similar threats. It spreads around with the help of fake security message claiming that computer is infected with possible virus. When the user clicks such a message, the trojan enters the system and quietly installs ransomware. In addition, it blocks the system and causes a fake warning message on victim's desktop. You can also download this threat to your computer as a useful email attachment or a pop-up ad that offers updating your Java or Flash Player.
Trojan.ZeroAccess is another seriously dangerous trojan horse, which is also known as max++. Note that there are many versions of this trojan and that they all seek the same aim - to steal people's personal information. Seeking this aim, they record every keystroke of the victim and can also make continuous screenshots. This trojan usually sneaks into the system from various Internet resources such as insecure web pages or peer-to-peer networks, and starts its work without wasting its time.
12Trojan.Win32.Krepper.ab is a very dangerous and extremely destructive parasite, which can cause serious issues related to your PC's stability. Usually, it gets into the system from insecure Internet resources, file sharing networks or online chats. It silently works in background waiting for the specified date to run its payload. On the specified date, Krepper virus can try to affect Windows Registry, deleting several critical system folders and initiate other destructive actions. The parasite detects, terminates and totally disables running antivirus software installed on the target computer. Moreover, the trojan is able to connect to various malicious servers and download other harmful parasites from there.
Trojans work in the same manner as the regular computer viruses and, therefore, should be removed from computer with the help of reliable security software. You should never try to remove a trojan horse from your computer manually because you can lead your machine to a serious issues and system damage. In order to get an ability to scan the system properly and find all questionable components on it, you should install any of these programs: SpyHunter, STOPzilla, Malwarebytes Anti Malware. They have already been approved for their capability to detect various trojans and their components.
Beware that sometimes even an advanced spyware remover can fail to help you in the removal of a particular trojan. Each of these threats is constantly updated and sometimes these updates are added before they are noticed by the developers of anti-spyware software. If one of these recommended tools failed to fix your computer, you can always contact our team and ask for advice.