give those answers
and these three answers also
Q3what is an e-mail virus?How does it spread?
Q4What is Ransomware virus? How does it spread?
Q5Write any three precautions that should be taken to prevent computer virus.
Answers
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What is a Boot Sector Virus? - Definition
A boot sector virus is a type of virus that infects the boot sector of floppy disks or the Master Boot Record (MBR) of hard disks (some infect the boot sector of the hard disk instead of the MBR). The infected code runs when the system is booted from an infected disk, but once loaded it will infect other floppy disks when accessed in the infected computer. While boot sector viruses infect at a BIOS level, they use DOS commands to spread to other floppy disks. For this reason, they started to fade from the scene after the appearance of Windows 95 (which made little use of DOS instructions). Today, there are programs known as ‘bootkits’ that write their code to the MBR as a means of loading early in the boot process and then concealing the actions of malware running under Windows. However, they are not designed to infect removable media.
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Downloadable Programs
Cracked Software
Email Attachments
Internet
Booting From CD
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An email virus consists of malicious code that is distributed in email messages, and it can be activated when a user clicks on a link in an email message, opens an email attachment or interacts in some other way with the infected email message.
Email viruses often spread by causing the attachment or malicious message to be sent to everyone in the victim's address book.
Email viruses can be packaged and presented in a variety of different ways. Some can easily be spotted as malicious by virtue of subject lines that don't make sense, suspicious sender or other header fields and body content that looks off in some way. Other email messages containing malware can be more difficult for recipients to identify, as they reflect considerable effort by the malicious actor to make the email message appear to be sent from a trusted and known sender. This is particularly true for phishing attacks carried out to further business email compromise attacks.
Email viruses are often connected with phishing attacks in which hackers send out malicious email messages that look as if they are originated from legitimate sources, including the victim's bank, social media, internet search sites or even friends and co-workers. The attacker's goal, in these cases, is to trick users into revealing personal information, such as the victim's usernames, full names and addresses, passwords, Social Security numbers or payment card numbers.
4-What is Ransomware?
Ransomware is a type of malicious software that infects a computer and restricts users’ access to it until a ransom is paid to unlock it. Ransomware variants have been observed for several years and often attempt to extort money from victims by displaying an on-screen alert.
How does a computer become infected with Ransomware?
Ransomware is often spread through phishing emails that contain malicious attachments or through drive-by downloading. Drive-by downloading occurs when a user unknowingly visits an infected website and then malware is downloaded and installed without the user’s knowledge.
5-Use a more secure operating system. Computer viruses often target Windows computers because so many more run on a Windows operating system. An alternative is to run a Linux operating system or Apple’s OSX.
Install anti-virus software and keep it up to date: it usually prevents the device from known viruses. The anti-virus software on a device must be kept up-to-date so that it can deal with new threats.
Never open email links that you don’t trust. Treat it as a source that you are not expecting, similar to executable files.
Be careful when opening graphics or media files. Although graphics and media files themselves are not viruses, it is possible for a virus to be disguised as a graphic or media file by assuming a false extension, such as .jpg. Opening files like this allows the virus to infect the device.
please select my answer as BRAINLIST
Answer:
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