CHAPTER-V 

TROJANS & BACKDOORS


TROJANS:
A destructive program that masquerades as a benign application. Unlike viruses, Trojan horses do not replicate themselves but they can be just as destructive. One of the most insidious types of Trojan horse is a program that claims to rid your computer of viruses but instead introduces viruses onto your computer.

The seven main types of Trojan horses are:
>Remote Access Trojans
>Data Sending Trojans
>Destructive Trojans
>Proxy Trojans
>FTP Trojans
>security software disabler Trojans
>denial-of-service attack (DoS) Trojans




BACKDOOR:

Also called a trapdoor. An undocumented way of gaining access to a program, online service or an entire computer system. The backdoor is written by the programmer who creates the code for the program. It is often only known by the programmer. A backdoor is a potential security risk.



Main functions of a Trojan 

>Stealing information's such a password, credit card info, screenshot's  ect.... with the help of a keylogger
>Reading files and calender 
>Disabling firewall and antivirus
>Infect your pc as a proxy server for future attacks
>Generate fake traffic to create DOS attack 
>Download spyware,ad ware ect.......
>Delete your system files
>To create and send spam messages
>Use victim pc as a botnet for DDos attack





Common PORTS used by Trojan to attack

BackOrifice:             UDP 31337 or 31338
Deep Throat:            UDP 2140 and 3150
NetBus:                      TCP 12345 and 12346
Whack-a-Mole:       TCP 12361 and 12362
NetBus 2:                  TCP 20034
GirlFriend:               TCP 21544
Master’s Paradise: TCP 3129, 40421, 40422, 40423, and 40426


For more lnfo visit http://www.doshelp.com/Ports/Trojan_Ports.htm



Symptoms that may indicate a Trojan infection

>Your computer screen flips upside down or inverts

>Your wall paper or background settings change by themselves

>Documents or messages print on your printer by themselves

>Your windows color settings change by themselves

>Your screen saver settings change by themselves

>Your right and left mouse buttons reverse their functions

>Your mouse pointer disappears

>Your mouse moves by itself

>Your mouse starts leaving trails

>Your Windows Start button disappears

>Your computer starts reading the contents of your computer clipboard

>Your Task bar disappears

>Your computer shuts down and powers off by itself 




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