Wednesday, April 3, 2013

What is one of the differences between viruses and worms and Trojans?

Idea merely by mrsj: What is the difference between a worm and a virus and one of those Trojan Horse things?

I know enough to know I don’t want either of them. My ISP has a ‘built in” anti ‘virus”. Does that protect me against worms and Trojans? And if you could tell me,in layman’s terms, what they do?

Thanks


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Answer by MyName_Is??

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Answer by contraswm

1. A computer virus attaches itself to a program or file enabling it to spread from one computer to another, leaving infections as it travels.


2. A worm is similar to a virus by design and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the capability to travel without any human action. A worm takes advantage of file or information transport features on your system, which is what allows it to travel unaided.


3.The Trojan Horse, at first glance will appear to be useful software but will actually do damage once installed or run on your computer. When a Trojan is activated on your computer, the results can vary.


Answer by lfefil

A program named “waterfalls.scr” serves as a simple example of a Trojan horse.


The author claims it is a free waterfall screen saver. When running, it instead unloads hidden programs, scripts, or any number of commands without the user’s knowledge or consent. Malicious trojan horse programs conceal and drop a malicious payload on an affected computer.


A computer virus is a computer program that can copy itself and infect a computer without the permission or knowledge of the user. The term “virus” is also commonly but erroneously used to refer to other types of malware, adware and spyware programs that do not have the reproductive ability. A true virus can only spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive. Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer.[1][2]


Viruses are sometimes confused with computer worms and Trojan horses, which are technically different. A worm can use security vulnerabilities to spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a program that appears harmless but has a hidden agenda. Worms and Trojans, like viruses, may cause harm to either a computer system’s hosted data, functional performance, or networking throughput, when they are executed. Some viruses and other malware have symptoms noticeable to the computer user, but most are surreptitious. This makes it hard for the average user to notice, find and disable and is why specialist anti-virus programs are now commonplace.


Most personal computers are now connected to the Internet and to local area networks, facilitating the spread of malicious code. Today’s viruses may also take advantage of network services such as the World Wide Web, e-mail, Instant Messaging and file sharing systems to spread, blurring the line between viruses and worms. Furthermore, some sources use an alternative terminology in which a virus is any form of self-replicating malware.


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What is one of the differences between viruses and worms and Trojans?

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