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Week 3 trojan, virus and a worm

Compare and contrast the similarities and differences between a trojan, virus and a worm. In what situation do you think each one might be used for a malicious purpose?

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Viruses, worms, Trojans, and bots are all part of a class of software called malware. Malware or malicious code. It is code or software that is specifically designed to damage, disrupt, steal, or in general inflict some other “bad” or illegitimate action on data, hosts, or networks (“What are viruses, worms, and Trojan horses?”, 2016).Malware appears to perform a useful or desirable function, but actually gains unauthorized access to system resources or tricks a user into executing other malicious logic(“SANS –Information Security Resources”, 2016).

Viruses: A hidden, self-replicating section of computer software, usually malicious logic, that propagates by infecting – i.e., inserting a copy of itself into and becoming part of – another program. A virus cannot run by itself; it requires that its host program be run to make the virus active (“SANS – Information Security Resources”, 2016)

Worms: Similar to viruses in that they are computer programs that replicate functional copies of themselves (usually to other computer systems via network connections) and often, but not always, contain some functionality that will interfere with the normal use of a computer or a program. Unlike viruses, however, worms exist as separate entities; they do not attach themselves to other files or programs. Because of their similarity to viruses, worms also are often referred to as viruses (“What are viruses, worms, and Trojan horses?”, 2016).

Trojan horses: A Trojan horse is a program that does something undocumented which the programmer intended, but that users would not accept if they knew about it. By some definitions, a virus is a particular case of a Trojan horse, namely, one which is able to spread to other programs (i.e., it turns them into Trojans too). According to others, a virus that does not do any deliberate damage (other than merely replicating) is not a Trojan. Finally, despite the definitions, many people use the term “Trojan” to refer only to a non-replicating malicious program

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