Trojan horses are broken down in classification based on how they breach systems and the damage they cause. The seven main types of Trojan horses are:
Email Trojan.
This is a type of Trojan an attacker use to gain remote control of a victim computer by sending e-mail messages. Attacker can then retrieve files or folders by sending commands through email.
Botnet Trojans
Botnet Trojans infect a large number of computers across a large geographical area to create a network of bots that is controlled through a command and control (C&C) center. Botnets is used to launch various form of attack on a victim including spamming, click fraud, and the theft of financial information.
FTP Trojans
This Trojan horse opens port 21 (the port for FTP transfer) and lets the attacker connect to your computer using File Transfer Protocol (FTP).
Data Sending Trojans
This type of Trojan horses is designed to provide the attacker with sensitive data such as passwords, credit card information, log files, e-mail address or IM contact lists. These Trojans can look for specific pre-defined data (e.g., just credit card information or passwords), or they install a Keylogger and send all recorded keystrokes back to the attacker.
Remote Access Trojans
Abbreviated as RATs, a Remote Access Trojan is designed to provide the attacker with complete control of the victim's system. Attackers usually hide these Trojan horses in games and other small programs that unsuspecting users then execute on their PCs.
This type of Trojan horses is designed to provide the attacker with sensitive data such as passwords, credit card information, log files, e-mail address or IM contact lists. These Trojans can look for specific pre-defined data (e.g., just credit card information or passwords), or they install a Keylogger and send all recorded keystrokes back to the attacker.
Remote Access Trojans
Abbreviated as RATs, a Remote Access Trojan is designed to provide the attacker with complete control of the victim's system. Attackers usually hide these Trojan horses in games and other small programs that unsuspecting users then execute on their PCs.
Destructive Trojans
This Trojan horse is designed to destroy and delete files, and it’s more like a virus than any other Trojan. It can often go undetected by anti virus software.
Security software disabler Trojans
This nasty Trojan horse stops or kills computer security software such as antivirus programs or firewalls without the user knowing. It’s usually combined with another type of Trojan as a “payload”.
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