Revision for Chapter 3

What are the types of malware?

• Viruses - Melissa Virus

• Worms - Code Red Worm

• Trojan horse,

  Logic bomb

• Ransomware

• Backdoors and Rootkits

Describe one malware that requires user's intervention

Answer explanation

Most viruses require end-user initiation, and can activate at a specific time or date

Explain the first characteristics of malware in computer systems.

Answer explanation

Disrupt computer operations without the user's knowledge or permission

Explain the second characteristics of malware in computer systems.

Answer explanation

Gain Access to computer systems, without the user's knowledge or permission

Describe one malware that does not require user participation

Answer explanation

Worms no longer require user participation

A malware silently carries out malicious operations

while Peter plays an online game. What malware is that?

Answer explanation

A Trojan horse is malware that carries out malicious operations under the guise of a desired operation such as playing an online game.

This malicious code exploits the privileges of the user that runs it. A trojan horse differs from a virus because the Trojan binds itself to non-executable files, such as image files, audio files, or games.

Four triggers that could awaken a malicious program like Logic Bomb are

• date

• time

• programs running

• delete user account

Answer explanation

A malicious program that uses a trigger to awaken the malicious code.

Name any computer hardware component that logic bomb can destroy

• cooling fans

• CPU

• power supplies

• hard drives

• memory

Describe one malware that attacks a computer system or the data it contains,

captive until the target makes a payment.

Answer explanation

Ransomware holds a computer system, or its data, captive until the target makes a payment. Ransomware usually works by encrypting data in the computer with a key unknown to the user. The user must pay a ransom to the criminals to remove the restriction.

Which Malware modifies the operating system to create a backdoor

to allow Attackers to use the backdoor to access the computer remotely?