7 ________________ gets installed & stays hidden in your computer’s memory. It stays involved to the specific type of files which it infects.
Answer: Direct Action Virus
8 _______________ infects the master boot record and it is challenging and a complex task to remove this virus.
Answer: Boot Sector Virus
9 The virus hides itself from getting detected by ______ different ways.
10 In mid-1981, the 1st virus for Apple computers with the name _________ came into existence.
11 In which year Apple II virus came into existence?
12 Which of them is not an ideal way of spreading the virus?
Answer: Official Antivirus CDs
13 A computer ________ is a malicious code which self-replicates by copying itself to other programs.
14 Which of the following is not a type of virus?
15 There are _________ types of computer virus.
16 What is the software called that’s designed to exploit a computer user and is a broad term covering computer viruses, worms, Trojan, adware, etc.?
17 Which of the following is a software that, once installed on your computer, tracks your internet browsing habits and sends you popups containing advertisements related to the sites and topics you’ve visited?
18 Which of the following is a program capable of continually replicating with little or no user intervention?
19 Which of the following is the type of software that has self-replicating software that causes damage to files and system?
20 Which of the following is a type of program that either pretends to have, or is described as having, a set of useful or desirable features but actually contains damaging code.
Malware covers malicious programs which are specifically designed to delete, block, modify, or copy data or to disrupt the performance of computers and/or computer networks. This class includes viruses, worms, Trojans, and other programs used to automatically conduct malicious activity [hacking tools, constructors which can be used to create polymorphic code etc.].
Viruses and Worms
Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate.
Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” [e.g. Backdoors] or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass.
The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates [i.e. how the malicious program spreads copies of itself via local or network resources.]
Any program within this subclass can have additional Trojan functions.
It should also be noted that many worms use more than one method in order to spread copies via networks. The rules for classifying detected objects with multiple functions should be used to classify these types of worms.
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Trojans
Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate.
Trojans are classified according to the type of action they perform on an infected computer.
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Suspicious packers
Malicious programs are frequently compressed – or packed – using a variety of methods combined with file encryption in order to prevent reverse engineering of the program and to hinder analysis of program behaviour with proactive and heuristic methods. Antivirus programs detect the results of the actions of suspicious packers, i.e. packed items.
There are ways to prevent packed files from being unpacked: for example, the packer may not decipher the code fully, only to the extent that it is executed; or it may fully decrypt and launch a malicious program only on a certain day of the week.
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Malicious tools
Malicious tools are malicious programs designed to automatically create viruses, worms, or Trojans, conduct DoS attacks on remote servers, hack other computers, etc. Unlike viruses, worms, and Trojans, malware in this subclass does not present a direct threat to the computer it runs on, and the program’s malicious payload is only delivered on the direct order of the user.