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A particular computer virus frequently infects personal computers

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Marshall & McDonough Moderator
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A particular computer virus frequently infects personal computers  [#permalink]

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22 Feb 2017, 20:36
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A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 05:07
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Vyshak wrote:
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.

Premises:
- A particular virus infects the PCs though mail.
- But it does not mean that the virus is not installed on the PC because ...

It is a kind of paradox. The virus scanning software is supposed to warn you when virus is installed. But the software does not warn about this virus. But that does not mean it is not installed!

Why?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective
What does "more effective" mean? That it spreads more easily? May be. But we don't know why the software does not alert even when the virus is present.

B. the virus was able to replicate itself and then send itself to people in the victim's address book
What the virus does is irrelevant. We are just wondering why the software does not alert us.

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active
Again, what happens after the virus stops spreading is irrelevant.

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool
This is why! The virus disabled the scanning software. That is why the software does not alert us of its presence. Resolves the paradox. Answer

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.
What the virus does is irrelevant. We are just wondering why the software does not alert us.

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Manager
Joined: 24 Oct 2013
Posts: 129
Location: India
Concentration: General Management, Strategy
WE: Information Technology (Computer Software)
A particular computer virus frequently infects personal computers  [#permalink]

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22 Feb 2017, 23:53
Answwer requires us to find an answer that would state "virus is not not blocked and it does exist".

Option A states that it is not detected becasue the virus is build effectively now.

I choose A
Marshall & McDonough Moderator
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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23 Feb 2017, 23:35
2
Question Type: Complete the passage

Main Point: No virus detection $$\neq$$ Virus installation blocked
Missing Info: The virus may be present in a disguised form

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective - Incorrect. Effectiveness of the virus is not disputed in the argument. Out of context.

B. the virus was able to replicate itself and then send itself to people in the victim's address book - Incorrect. Out of scope.

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active - Incorrect. Out of scope.

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool - Correct. If the virus disguised itself in the system as a virus removal tool then it it undetected.

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system. - Incorrect. Again this is not relevant to the main point.

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Re: A particular computer virus frequently infects personal computers  [#permalink]

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24 Oct 2018, 04:50
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

We need to find a reason to support the point. Only D fits in as it presents the alternate why the virus is not detected even when it's present.
Manager
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Posts: 103
A particular computer virus frequently infects personal computers  [#permalink]

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24 Oct 2018, 09:42
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A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective. OFS - this does not explain why virus is undetected

B. the virus was able to replicate itself and then send itself to people in the victim's address book. OFS - this does not explain why virus is undetected

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active. OFS - no reason why virus is undetected

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool. Correct

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system. OFS - no reason why virus is undetected
Intern
Joined: 09 Nov 2016
Posts: 5
Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 03:03
D is the most relevant of all. so D should be answer
Intern
Joined: 16 Oct 2017
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 03:06
abhijeet4316 wrote:
D is the most relevant of all. so D should be answer

Yes, You are right!
Thanks for the explanation!
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 07:33
1
Vyshak wrote:
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective--- it can still be detected by virus scanning software ,wrong

B. the virus was able to replicate itself and then send itself to people in the victim's address book--- irrelevant

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active---incorrect

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool--- relevant

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.[/quote]-- incorrect
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Joined: 02 Sep 2009
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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20 Aug 2019, 00:01
Vyshak wrote:
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.

OFFICIAL EXPLANATION:

Reading the question: We have seen a fill-in-the-blank question before, in "Auto Body." Such questions may be phrased with or without a printed line signifying the blank. As we discussed in Auto Body, what goes in the blank should be a logical continuation of the prompt. Logical tests tend not to be possible on this type of question, so we will rely on our filter, ideally a prediction.

Creating a filter: how can we predict what goes in the blank? It must not contradict what has come before and it should finish the expression of the idea. The key is that the virus is on the computer even though the scanning software hasn't detected it. We could imagine that there is a defect in the scanner, or an ingenious design to the virus. Note that you are not expected to know anything about IT security for this question. Critical Reasoning questions are designed not to require any outside knowledge. Outside knowledge may still be useful, inevitably, and that's why the questions cover a range of topics. We could decide on the prediction, "The virus has outsmarted the security systems," as our filter.

Applying the filter: Do any answer choices match our prediction? Choice (A) somewhat does, but rather vaguely. Choice (B) doesn't address why the virus wasn't detected. Choice (C) also doesn't seem to address why the virus wasn't detected, though we might be able to read something into the term "backdoor." Choice (D) would definitely constitute outsmarting the security system. Choice (E) involves outsmarting, but not in a way that would necessarily obscure detection. We're left with (D). We confirm the logic: the correct answer must give an explanation for how a virus might have gone undetected by security systems. Choice (D) is the only option. Choice (C) sounds close, but we presume that many viruses possess backdoors and are detected.

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Re: A particular computer virus frequently infects personal computers   [#permalink] 20 Aug 2019, 00:01
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