What is a Trojan Horse?
This term “Trojan Horse” comes from a Greek story of ancient times, in which the Greeks gifted a giant wooden horse to the Trojans as a peace offering. However, a nasty move awaited the Trojans as Greek soldiers jumped out of the hollow horse and captured Troy. In the same way, a Trojan horse virus presents itself as a useful computer program, while it actually causes disorder and damage to your computer.
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Increasingly, Trojans are the first stage of an attack and their primary purpose is to stay hidden while downloading and installing a stronger threat such as a bot. Unlike viruses and worms, Trojan horses cannot be spread themselves they need help. They are often delivered to a victim through an email message where it masquerades as an image or joke, or by a malicious website, which installs the Trojan horse on a computer through vulnerabilities in web browser software such as Microsoft Internet Explorer. After it is installed, the Trojan horse lurks silently on the infected machine, invisibly carrying out its misdeeds, such as downloading spyware, while the victim continues on with their normal activities.
Malicious Effects of Trojan
Once initiated, Trojans can permit cyber-criminals to spy on you, steal your sensitive data, and gain backdoor access to your system. These actions can include but are not limited to:
- Deleting data
- Blocking data
- Modifying data
- Copying data
- Disrupting the performance of computers or computer networks
- Creating backdoors: makes changes to your security system so that other malware or even a hacker can get in.
- Spying: is designed to wait until you access your online accounts or enter your credit card details, and then send your passwords and other data back to their master.
- Send costly SMS messages: even smartphones get Trojans, and the most common way for criminals to make money is by using them to make your phone send costly SMS messages to premium numbers.
Precautional Trojan horse virus removal steps?
- Stay away from questionable sites.
- Avoid using pirated materials like CD, USB and flash drives
- Distance your computer from dubious links, but in the long run something will get through.
- If you truly want to stay protected, you need an anti-malware software All in one free Malware Removal tool?
Trojans are categorized as per the type of actions that they can perform on your computer:
A backdoor Trojan gives nasty remote control over the infected computer. They enable the creator to do anything they wish on the infected computer – including sending, receiving, launching and deleting files, displaying data and rebooting the computer. Backdoor Trojans are often used to club a group of victim computers to form a botnet or zombie network that can be used for criminal purposes.
Exploits are programs that contain data or code that takes advantage of a susceptible application within the software that’s running on your computer.
Rootkits are designed to cover certain objects or activities in your system. Often their main purpose is to prevent malicious programs from being detected – in order to extend the period in which programs can run on an infected computer.
Trojan-Banker programs are created to snip away your account data for online banking systems, e-payment systems and credit or debit cards.
These programs are created to execute DoS (Denial of Service) attacks against a targeted web address. It works by sending multiple requests – from your computer and several other infected computers – the attack can overwhelm the target address… leading to a denial of service.
Trojan-Downloaders as the name indicates, downloads and installs new versions of malicious programs onto your computer – including Trojans and adware.
These programs help the cyber hackers in order to install Trojans and / or viruses – or to prevent the detection of malicious programs. Not all antivirus programs are capable of scanning all of the components inside this type of Trojan.
Trojan-FakeAV programs aids antivirus software to executes its operation. They are designed to extort money from you, for the detection and removal of threats… even though the threats that they report are actually non-existent.
This type of program steals user account information from online gamers.
These kinds of programs give away your logins and passwords for instant messaging programs – such as ICQ, MSN Messenger, AOL Instant Messenger, Yahoo Pager, Skype and many more to cyber criminals.
This is a kind of money exhaustion trojan which can modify data saved on your computer – so that your computer doesn’t run correctly or you can no longer have access to the specific data. The criminal will only restore your computer’s performance or unblock your data, after you have paid them the ransom money that they demand.
These programs can cost you money – by sending text messages from your mobile device to premium rate phone numbers.
Trojan-Spy-works like a spy programs, it shares details on how you’re using your computer – for example, by tracking the data you enter via your keyboard, taking screen shots or getting a list of running applications.
Trojan-Mailfinder –These programs can harvest email addresses from your computer.
Other types of Trojans include:
Tips to Prevent Trojan From Infecting Your System:
- Enable your popup blocker: Pop-ups and ads in the websites are the most adoptable tactic used by cyber criminals or developers with the core intention to spread malicious programs. So, avoid clicking uncertain sites, software offers, pop-ups etc.
- Keep your Windows Updated:To avoid such infections, we recommend that you should always keep your system updated through automatic windows update. By doing this you can keep your device free from virus. According to survey, outdated/older versions of windows operating system are an easy target.
- Third party installation:Try to avoid freeware download websites as they usually install bundled of software with any installer or stub file.
- Regular Back up: Regular and periodical backup helps you to keep your data safe in case the system is infected by any kind of virus or any other infection. Thus always backup important files regularly on a cloud drive or an external hard drive.
- Always have an Anti-Virus: Precaution is better than cure. We recommend that you install an antivirus like McAfee or a good Malware Removal Tool like Free Malware RemovalTool. Apart from this we would suggest a regular updating of these software to detect and avoid latest infections.