Computer Trojan Horse Virus Information

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What is a Trojan horse? Computer Trojan Horse Virus Information Introducing you to the major types of Trojan horses and how they operate.





Trojan horses are broken down into categories based on how they breach systems and the damage they cause.



The seven main types of Trojan horses are:

Remote Access Trojans

Data Sending Trojans

Destructive Trojans

Proxy Trojans
This kind of Trojan horses is designed to use the victim's computer as a proxy server. This lets the attacker do anything from your computer, including credit card fraud and other illegal activities and even use your system to launch malicious attacks against other networks.

FTP Trojans

Security software disabler Trojans

Denial-of-service attack (DoS) Trojans



Trojans trends


Quarterly reports confirm the high amounts of infections spreading across machines worldwide. It is a fact that the numbers of new threats are significantly increasing and submissions are up with 15% compared to the last quarter of 2010.


Trojans are known as the most widely spread infection type across computer systems accounting for approximately 70% of all detected malware, followed by traditional viruses and worms.


Malware distribution


Although the number of new Trojans is increasing rapidly, not all Trojan types have followed the same trend. While rogue antiviruses (software posing as a legitimate antivirus with the purpose of extorting users in paying for the removal of false infections) have been slowly decreasing, downloader Trojans are becoming more popular due to their small print left on targeted machines. Once a downloader infects a computer system, it starts downloading additional infections.


Country reports show that China still holds the first place with infection rates of approximately 65% of which more than 75% are Trojans, closely followed by Thailand, Japan, Russia and Turkey as shown in the graph below.


Trojans per country

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