Viruses can be disguised as attachments of funny images, greeting cards, or audio and video files. Computer viruses also spread through downloads on the Internet. They can be hidden in pirated software or in other files or programs that you might download. Microsoft PC Security website.

Examples of computer viruses Trojans – As in the myth, a Trojan is a virus that hides within a legitimate-seeming program to spread itself across networks or devices. Ransomware – Ransomware is a type of malware that encrypts a user’s files and demands a ransom for its return.

A ‘person who creates a computer virus’ is a programmer.

The main types of computer virus are as follows:

• Boot Sector Virus.
• Direct Action Virus.
• Multipartite Virus.
• Polymorphic Virus.
• Resident Virus.
• File Infector Virus.

The concern that viruses might spread to other computers on a network stems mostly from the knowledge that these threats can self-replicate. However, that function doesn’t necessarily apply across networks. Users who share files between two computers might accidentally transfer a virus from one to the other.

If you notice any of the following issues with your computer, it may be infected with a virus: Slow computer performance (taking a long time to start up or open programs) Problems shutting down or restarting. Missing files.

9 Warning Signs Your Computer Is Infected With Spyware

1. Your browser has been hijacked.
2. You conduct a search but another, unauthorized browser completes it for you.
3. Your computer is unstable, sluggish, locks up, or crashes frequently.
4. You constantly get pop-up ads displayed on your screen, even if you aren’t browsing the Internet.

If your PC has a virus, following these ten simple steps will help you to get rid of it:

1. Step 1: Download and install a virus scanner.
2. Step 2: Disconnect from internet.
3. Step 3: Reboot your computer into safe mode.
4. Step 4: Delete any temporary files.
5. Step 5: Run a virus scan.
6. Step 6: Delete or quarantine the virus.

13+ Warning Signs that Your Computer is Malware-Infected [Updated 2019]

1. Your computer is slowing down.
2. Annoying ads are displayed.
3. Crashes.
4. Pop-up messages.
5. Internet traffic suspiciously increases.
6. Your browser homepage changed without your input.
7. Unusual messages show unexpectedly.
8. Your security solution is disabled.

How to remove malware from a PC

1. Step 1: Disconnect from the internet.
2. Step 2: Enter safe mode.
3. Step 3: Check your activity monitor for malicious applications.
4. Step 4: Run a malware scanner.
5. Step 5: Fix your web browser.
6. Step 6: Clear your cache.

It is also an easy one.

1. Just go to the Settings on your android phone.
2. Navigate to the Apps icon.
3. Choose App Manager to find the full list of your apps.
4. Select the infected apps.
5. An Uninstall/Force close option should be right there.
6. Choose to uninstall, and this will remove the app from your phone.

The 5 Most Dangerous Types of Malware to Be Cautious of in 2020

1. Ransomware – a Corporate Level Threat. Extorting and exploiting innocent yet naive internet users just won’t do for big shot hackers anymore.
2. Mobile Malware – Not Pocket-Friendly.
3. Adware – the Annoying Salesperson.
4. Remote Access Trojans (RAT) – Uninvited Guests.
5. Banking Trojans – Better Not Let Them In.

In short, malware can wreak havoc on a computer and its network. Hackers use it to steal passwords, delete files and render computers inoperable. A malware infection can cause many problems that affect daily operation and the long-term security of your company.

The terms “virus” and “malware” are often used interchangeably. Malware is a catch-all term for any type of malicious software, regardless of how it works, its intent, or how it’s distributed. A virus is a specific type of malware that self-replicates by inserting its code into other programs.

Worms are a self-replicating type of malware (and a type of virus) that enter networks by exploiting vulnerabilities, moving quickly from one computer to another. Because of this, worms can propagate themselves and spread very quickly – not only locally, but have the potential to disrupt systems worldwide.

Spam may or may not be malware. Spam is defined as unwanted and unsolicited messages sent to an enormous list of recipients. Spam can turn into malware when it contains a malicious program that accesses your device when you open the email attachments or links.

A Trojan horse or Trojan is a type of malware that is often disguised as legitimate software. Trojans can be employed by cyber-thieves and hackers trying to gain access to users’ systems.

Here are the top ten notorious computer viruses of all time.

• Morris Worm. Let us start our journey with Morris Worm or the “Great Worm”, which is believed to be the pioneer among computer worms distributed through the internet.
• Nimda.
• ILOVEYOU.
• SQL Slammer.
• Stuxnet.
• CryptoLocker.
• Conficker.
• Tinba.

How to remove a Trojan virus. It’s best to use a Trojan remover that can detect and remove any Trojans on your device. The best, free Trojan remover is included in Avast Free Antivirus. When removing Trojans manually, be sure to remove any programs from your computer that are affiliated with the Trojan.

A Trojan horse, or Trojan, is a type of malicious code or software that looks legitimate but can take control of your computer. A Trojan is designed to damage, disrupt, steal, or in general inflict some other harmful action on your data or network. Once installed, a Trojan can perform the action it was designed for.

Mydoom virus

Trojan malware takes its name from the classical story of the Trojan horse, because it imitates the technique to infect computers. A Trojan will hide within seemingly harmless programs, or will try to trick you into installing it.

Here is one example of how a Trojan horse might be used to infect a personal computer: The victim receives an official-looking email with an attachment. The attachment contains malicious code that is executed as soon as the victim clicks on the attachment.

Signs of a Trojan Virus

1. Slow computer.
2. Blue screen of death.
3. Strange pop-ups.
4. Unfamiliar add-ons and plugins.
5. Applications acting strange.
6. Disabled security application such as UAC.
7. Insufficient memory.
8. Changed desktop.

This list will make you understand the different types of Trojan horses and what do they do:

• Backdoor. It gives malicious users remote access over the infected computer.
• Exploit.
• Rootkit.
• Trojan-Banker.
• Trojan-DdoS.
• Trojan-Downloader.
• Trojan-Dropper.
• Trojan-GameThief.

Trojan horses are broken down into categories based on how they breach systems and the damage they cause.

• The seven main types of Trojan horses are:
• Remote Access Trojans.
• Data Sending Trojans.
• Destructive Trojans.
• Proxy Trojans.
• FTP Trojans.
• Security software disabler Trojans.
• Denial-of-service attack (DoS) Trojans.