Virus, worms and trojans ????

Question

I need a DETAILED information of the difference between viruses,worms and trojan hourses...

Answer 1

Trojans  WHAT IS TROJANS? Trojan or Trojan Horse is a destructive program that masquerades as a benign application. The term comes from Greek mythology about the Trojan War, as told in the Aeneid by Virgil and mentioned in the Odyssey by Homer. According to legend, the Greeks presented the citizens of Troy with a large wooden horse in which they had secretly hidden their warriors. During the night, the warriors emerged from the wooden horse and overran the city. In computers a Trojan may refer to a program that appears as something you may think is safe, it may be some kind of picture or audio or video file that would attract a user and would force him to open it. Surprisingly hidden inside is usually something harmful, probably a worm or a virus. These cut programs or images typically arrive through e-mail, as attachments. But not always. Sometimes they can be downloaded through FTP servers or Crack sites as some type of software, which may be described as very useful. After installation Trojan gains control over your system, and with that hackers may do a lot of harm. Trojan can change your desktop or add unwanted shortcuts or they can cause serious damage by deleting files and destroying information on your system. Trojans may also create a backdoor on your computer that gives malicious free access to your system. By the help of Trojans, malicious users can access confidential or personal information. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate and each new victim must run the infected file.To avoid such risks, you should never download files from unknown sites and people, or click on links which were offered by them. Even if you're getting a file from a friend it may still be infected. Your friend may not know if he is infected. You should also avoid using programs which automatically preview your images.

Worms (10) Worms WHAT IS WORMS? Computer Worms are reproducing programs that run independently and travel across network connections. Many worms have been created which are only designed to spread, and don't attempt to alter the systems they pass through. Main difference between viruses and worms is the method in which they reproduce and spread. Worms are very hard to detect on computers because they are made with an intriguing mathematical technological structure and complexity. An Internet worm can be contained in any kind of virus, program or script. Usually they spread through e-mail or IM messages any form of attachment or link in an email may contain a link to an infected website. In first case activation starts when a user clicks on the attachment while in the second case the activation starts when clicking the link in the email. The most dangerous are internet Worms which will scan all available network resources, try to connect to those systems and gain full access to them. Sometimes inventor will release it into the wild in a single copy, and it will be able to mutate, replacing its own code by itself.

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Answer 2

Worms

This category of malicious program spreads itself largely by exploiting vulnerabilities in your computer operating systems. The class was named for the way that the worm crawl from computer to computer,using networks and email. This feature allows worms to spread themselves very rapidly.

Viruses

Viruses are programs which infect other files, adding their own code to them to gain control of the infected files when they are opened. This simple definition explains the fundamental action performed by a Virus-infection.

Trojans

Trojans are programs which carry out unauthorized actions on computers,such as deleting information on drives,making the system hang,stealing confidential information,and so on. This class of malicious program is not a Virus in the traditional sense of the word,because it does not infect other computers or data. Trojans cannot break into computers on their own and are spread by Hackers who disguise them as regular software.

Answer 3

Worms are self-replicating, which means it sends copies of itself to other computers without human intervention. Unlike a virus, it does not need to attach itself to an existing program.

Virus, including malware and adware, can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a floppy disk, CD, or USB drive.

Trojansis malware that appears to perform a desirable function but in fact performs undisclosed malicious functions.

Answer 4

go here:

http://en.wikipedia.org/wiki/Computer_vi...