Have you ever downloaded and installed an application on a computer or mobile device that looks legitimate software but ended up being a problem?
A trojan is a type of application that disguises itself as legitimate, but it is not. Trojans are used by hackers, cyber thieves, and other cyber-criminals to take control of your device and do malicious activity. The application has a design that enables it to steal, damage, disrupt, and cause harm to your machine, data, or network.
A trojan horse virus will act as a legitimate application to deceive you into downloading programs and executing them on your machine. Once it is on your PC or mobile device, the Trojans can execute the purpose for which it was designed. Check out all the best anti-malware here, and while there, take a look at the best free security software, best antiviruses overall in this post, and the best antivirus to remove Trojans. We thought of Linux users by reviewing the best internet protection for that OS and by answering this common question - Does Linux need antivirus?
How Do Trojans Work?
Trojans get into your machine and execute in several ways.
For instance, you can get an email attachment from the email addresses of someone you think is known to you. The Trojans may be disguised as the email attachment and trick you into opening it.
Unknown to you, the email may be from a cybercriminal, and the malicious attachment has downloaded and installed Trojan malware on your device.
The Trojan malware can spread and infect other files in your PC's user account and can damage the machine. Also, find out more about malware here.
What Does a Trojan Virus Do on an Infected Computer?
Trojan viruses will conceal its true content from the user to trick you into downloading and executing it while using your computer or mobile device. Can Chromebooks get viruses is another question we get a lot. The name Trojan virus is derived from the wooden horse that was used to sack Troy. Just like the wooden horse that seemed harmless but was full of soldiers on the inside, the malware looks harmless from the outside. However, when you install it on your device, it causes serious harm and threats.
Once you activate the backdoor Trojan, it enables cybercriminals to steal your user data, spy on you, gain back door entry into your device, and steal your user sensitive data. So, learn how to tell if someone is hacking your computer with the help of this article and also know how to recognize the threat with our 'What Antivirus Do I Have?' post.
Some of the harmful actions that the Trojan virus can execute include:
- Modifying your data
- Blocking data
- Selecting data from your device
- Copying data
- Disrupting the performance of your computer or computer networks
Are Trojans the same as viruses?
The names Trojan malware and Trojan viruses are used interchangeably. A Trojan horse malware and Trojan viruses are similar in a variety of ways. For instance, a Trojan horse malware will execute itself on your computer and other devices to steal your user account information and destroy your sensitive data. It will also spy and track your online activities, just like a virus. The two will also negatively affect your computer's performance. Just like the spyware, we respectively explained in this article.
They are also similar in how they find their way into your machine. You can transfer the malware into your PC from links and email attachments, and other malicious programs running, disguising themselves as genuine. And you can also find out what a computer worm is, or learn here how to detect keylogger spyware.
But a Trojan infection is different from a virus in several ways. For instance, a virus can replicate itself and spread to other devices through social engineering and weakens a computer’s performance without human interaction. On the other hand, a Trojan cannot self replicate itself in your device, but it requires you to execute it.
It will disguise itself as a genuine app to trick you into loading and executing it on your PC. Unfortunately, to get rid of Trojans, you are generally expected to opt for a higher antivirus payment package as already mentioned in our Lookout vs AVG post, or AVG vs. AVG Protection review.
How to Detect Trojan Viruses on Your Device
Be cautious and stay safe. Different types of Trojans are used to deliver different types of malware into your device. As such, if you suspect you have a Trojan infection, you should look out for the signs and symptoms of malicious software in your device and/or text messages or instant messaging.
So of the telltale signs will include:
- A decline in the performance of the infected computer. The device can start running slower than usual, and applications can start crashing more frequently
- You can start experiencing more malware pop-ups and spam interruptions on your computer. The number of pop-ups from your browser or email spam can become more frequent
- You can also start noticing strange behavior on your device. Some specific programs can start running even when you don't execute them. The trojan virus can also modify your document such that you can start noticing new or strange icons on your device.
If your device is exhibiting such symptoms, it's possible it has a Trojan or any other type of virus infection. Try to look for any programs or applications that you cannot remember downloading or installing on your PC. In addition, check out our earlier post to find out what to do when you experience issues with uninstaling antivirus like AVG.
If you have an unrecognized file name or program, type its name on a search engine to determine if it is a recognized Trojan.
You can also get reliable anti-virus software (see 'AVG vs McAfee here, or AVG vs Bitdefender review) scan your computer that could give your PC real-time protection to determine if there is any malicious file in the device. Be cautious of the anti-virus software you use as some of them are disguised as antiviruses (see 'AVG vs Panda' review), but they are malicious viruses themselves.
Common Types of Trojans
A backdoor Trojan allows hackers and other malicious users to remote access the infected computer. The hackers can download, upload, and also execute files at will. They also have an option to install additional malware onto your computer.
The malicious users can also send and receive files, display data and reboot the infected device.
Backdoor Trojans can also be used to unite a group of infected computers to form a zombie or botnet network used to conduct criminal activities. Additionally, the botnet is capable of bringing an entire website down using a distributed denial-of-service assault.
Exploits are malicious programs on your computer that contain codes or data that takes advantage of a vulnerability in your computer to infect it.
A Trojan banker or banking trojan is a dangerous program designed to steal your account data or banking information for your e-payment systems, financial accounts, debit or credit cards, and online banking systems.
These types of Trojans conduct Distributed Denial of Service (DDoS) attacks against a targeted web address.
The Trojans work by sending several requests from your computer and other infected devices. The attacks will overwhelm the targeted address, which can lead to denial of service.
A downloader Trojan will download and install new versions of unsafe programs - see 'Is AVG Antivirus Safe?' post - on your device, including adware and other malware or Trojans.
Trojan -fake AV
These Trojans will copy the activities of the antivirus software protection (see here whether the ultimate security packages can keep your device safe from this threat). The Trojans are designed to extort money from you, and in return, they are supposed to detect and remove threats from your computer system. However, the threats that they report on your computer are non-existent.
This Trojan infects your mobile devices and is capable of transmitting and intercept text messages. As a result, texts to premium-rate lines can significantly increase your phone bill.
This Trojan is designed to steal information and the email addresses stored on your device.
This Trojan demands a ransom to repair the harm it has caused to your machine.
Since 2013, this malware has been active. Recently, it has been able to transmit ransomware or a crypto-jacker to compromised PCs, allowing thieves to utilize your system for mining bitcoin. Cryptolocker encrypts the user's hard drive's contents and requires a ransom to the developer to obtain the decryption key. “Coin mining grew exponentially in the latter months of 2017,” according to the 2018 Internet Security Threat.
How to Protect Your Device From Trojan Horse Malware
If you want to secure your machinefrom common types of trojan attacks, here are some dos and don't that can be of help:
What is a Trojan virus? This is a question that internet users grapple with. A trojan is a malware disguised as a legitimate program to entice you to install it on your machine. When you install trojans, it can carry out various harmful tasks such as stealing your data, modifying and deleting files, and enable backdoor access to your operating systems. You can prevent your system from Trojan attacks by preventing downloads from unknown sources, having Trojan antivirus software (see Norton vs AVG review, or AVG vs KAspersky post) among other measures.
1. What does a Trojan virus do?
Trojan viruses are meant to extract money from you in exchange for detecting and removing dangers, even if the threats they report are fictitious. This type of software steals information about internet players' accounts.
2. Can Trojan virus be removed?
Yes, you can delete some Trojans by deactivating startup items that do not originate from trusted sources on your computer. To achieve the best results of removing the effect of trojan horse attacks, reboot your machine into safe mode first. This prevents the virus from preventing you from eliminating it.
3. Is Trojan virus dangerous?
Trojan horses (or Trojans) are among the most prevalent and destructive types of malware that may infect your computer or mobile devices. Trojan horses are typically disguised as benign or useful software that you download from the Internet, but they include malicious code intended to cause harm—hence their name.
4. How do you know if you have a Trojan virus?
Signs that your computer is infected with a Trojan virus hidden inside your machine..
- Awkward computer behavior.
- The dreaded blue screen of death.
- Odd pop-up windows.
- Unfamiliar plugins and add-ons installed.
- Applications that behave strangely.
- Security applications such as UAC have been disabled.
- Inadequate memory.
- Modified desktop settings.
5. Where Do Trojans Hide?
Trojans may conceal themselves in unexpected locations, including emails, downloads, and more. Therefore, it is always prudent to exercise caution to avoid this sort of virus. Anti-Trojan applications can help defend you against Trojan infections.