any body knows what is Trogan viruse ...thanx?

Question

just want to know information about it

Answer 1

Definitions

Virus
A virus is a program that propagates itself by infecting other programs on the same computer. Viruses can do serious damage, such as erasing your files or your whole disk, or they may just do silly/annoying things like pop up a window that says "Ha ha you are infected!" True viruses cannot spread to a new computer without human assistance, such as if you trade files with a friend and give him an infected file (such as on a floppy or by an email attachment).

Worm
Like a virus, a worm is also a program that propagates itself. Unlike a virus, however, a worm can spread itself automatically over the network from one computer to the next. Worms are not clever or evil, they just take advantage of automatic file sending and receiving features found on many computers.

Trojan horse
This is a very general term, referring to programs that appear desirable, but actually contain something harmful. The harmful contents could be something simple, for example you may download what looks like a free game, but when you run it, it erases every file in that directory. The trojan's contents could also be a virus or worm, which then spread the damage. See our Trojan horse help page for more information.

Cracker
Crackers are often mistakenly called "hackers". Crackers are the "bad guys" who seek to "crack" or gain unauthorized access to computers, typically to do malicious things e.g. to steal credit card information or crash the computer. Crackers might do this by writing a virus, worm, or Trojan horse. Alternatively, they may just exploit weaknesses in the computer's operating system in order to gain entry. Many crackers will install a "backdoor" which allows the cracker to "remote control" your computer over the internet, such as to distribute child porn or perform a denial of service attack against somebody else. Most crackers are just bored, anti-social kids who aren't particularly smart and just take advantage of well-known, existing exploits or the gullibility of the typical internet user.

Hacker
When used properly, this term refers to an elite breed of "good guys" who are talented computer programmers. They enjoy solving challenging problems or exploring the capabilities of computers. Like a carpenter wielding an axe to make furniture, the hacker does good things with his skills. True hackers subscribe to a code of ethics and look down upon the illegal and immoral activity of crackers (defined above). When the press uses "hackers" to describe virus authors or computer criminals who commit theft or vandalism, it is not only incorrect but also insulting to true hackers.

Land of Confusion

OK so you think you've got those terms all straight in your head? Prepare to be confused. :-)

Remember the "Love Bug"? Is it a virus, worm, or trojan? Answer: all three! It's a trojan because it pretends to be a love letter when it is really a harmful program. It's a virus because it infects all the image files on your disk, turning them into new trojans. Finally, it's also a worm because it propagates itself over the internet by hiding in trojans that it sends out using your email address book, IRC client, etc.

Here's another one. Traditionally you use anti-virus programs to check your computer for viruses and prevent their spread. The problem is, traditional viruses don't really exist any more. Nowadays, lame crackers are busy making trojans and worms, so that's what anti-virus programs try to tackle now. The problem is, with everybody online these days, trojans and worms are fast to spread and easy to modify, so anti-virus programs are useless in trying to prevent them. If you're lucky, then can remove the infection after the fact, assuming your disk isn't so messed up there is nothing left to disinfect.

Oh that's not all. Firewalls are network barriers designed to keep out crackers. With the recent proliferation of trojans which install a backdoor program, however, a whole new market has sprung up in "personal firewalls" which are programs that run on your PC and can block communications from some backdoor programs. Since file downloads are a normal part of your internet experience, however, personal firewalls can't stop you from downloading the trojan that installs that backdoor in the first place.

Answer 2

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Answer 3

Trojan Horse are programs that appear desirable (meaning a software that makes you like it such as a weather toolbar), but actually contain something harmful. The trojan's contents could also be a virus or worm, which then spread the damage.

Ok, let's put this in terms of history. Remember the past that exists a Trojan Horse, a big wooden horse? It looks some sort of a big present surprise for the king, but inside there's lots of soldiers who are ready to attack.

So this is something like in your system. You're the king, and you like the horse (software), but as soon as you oder your men to open the present, the soldiers (viruses) came out and you're dead.

Answer 4

Worms And Trojan Horses

A Worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole. It copies itself to the new machine using the security hole, and then starts replicating from there, as well. The term worm was coined by John Brunner, a science fiction writer, in his 1975 novel Shockwave Rider. The hero, a talented programmer, created self-replicating computer programs that tunneled their way through a worldwide network.

A Trojan Horse is simply a malicious computer program that damages your computer system upon installation. The program claims to do one thing, such as pretending to be a game, but instead do something else when you run them. Some nasty Trojans will actually attempt to erase your hard drive. They were originally named after the historic Trojan horse used by the Greeks to conquer Troy because the first Trojan horse programs pretended to be innocent games or applications. Trojan horses have no way to replicate themselves automatically. Below you will find some of the various ways that viral related attacks can be transmitted and spread.

Answer 5

Trojan horse
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Def- In computers, a Trojan horse is a program in which malicious or harmful code is contained inside apparently harmless programming or data in such a way that it can get control and do its chosen form of damage, such as ruining the file allocation table on your hard disk. In one celebrated case, a Trojan horse was a program that was supposed to find and destroy computer viruses. A Trojan horse may be widely redistributed as part of a computer virus.

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.

Answer 6

In simple terms, just like the Trojan Horse of Greek mythology, its a programme that someone might send to you. It looks like somthing interesting and harmless, but when you open (or run) it on your system, It releases malicious code that will do some damage to your system or files.

Most anti viruses will protect you against them. Of course you shouldnt be opening and running any unknown attachment that just comes into your mail box.

Answer 7

A virus and a trojan are two different types of program.
A trojan conceals itself within apparently safe code. Its aim is usually to steal information about you.
A virus tries to spread itself, its aim is to damage your data or interfere with you using it.

Most anti virus programs will pick up some trojans; but you also need anti spyware. Trojans are popularly known as spyware.

Answer 8

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Answer 9

trojan horse is one example of virus, it can destroy your files in all drives....you must have anti virus to prevent attacking your files

Answer 10

n00b.