Unlike computer viruses, a Trojan horse cannot manifest by itself, so it needs a user to download the server side of the application for it to work. This means the executable (.exe) file should be implemented and the program installed for the Trojan to attack a device’s system.
A Trojan virus spreads through legitimate-looking emails and files attached to emails, which are spammed to reach the inboxes of as many people as possible. When the email is opened and the malicious attachment is downloaded, the Trojan server will install and automatically run every time the infected device is turned on.
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Devices can also be infected by a Trojan through social engineering tactics, which cyber criminals use to coerce users into downloading a malicious application. The malicious file could be hidden in banner advertisements, pop-up advertisements, or links on websites.
A computer infected by Trojan malware can also spread it to other computers. A cyber criminal turns the device into a zombie computer, which means they have remote control of it without the user knowing. Hackers can then use the zombie computer to continue sharing malware across a network of devices, known as a botnet.
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For example, a user might receive an email from someone they know, which includes an attachment that also looks legitimate. However, the attachment contains malicious code that executes and installs the Trojan on their device. The user often will not know anything untoward has occurred, as their computer may continue to work normally with no signs of it having been infected.
The malware will reside undetected until the user takes a certain action, such as visiting a certain website or banking app. This will activate the malicious code, and the Trojan will carry out the hacker’s desired action. Depending on the type of Trojan and how it was created, the malware may delete itself, return to being dormant, or remain active on the device.
Trojans can also attack and infect smartphones and tablets using a strand of mobile malware. This could occur through the attacker redirecting traffic to a device connected to a Wi-Fi network and then using it to launch cyberattacks.
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