What Are The 5 Worst Computer Viruses?

What are the top 5 computer viruses?

Top 5 Most Destructive Computer Viruses of All Time#1 ILOVEYOU.

This is one of the first major, and still most damaging, computer virus ever created.

#2 Melissa.

This virus was created by David L.

#3 Code Red.

#4 Sobig Worm (Sobig.

#5 Mydoom.

How can you protect yourself?.

Are all computer viruses harmful?

It’s true that most viruses are programmed to do damage. But viruses aren’t inherently bad — after all, they’re just pieces of code. … An anti-virus virus that could find and then remove other harmful viruses. A file-compressing virus that could “infect” and then compress the files it attaches to.

Is iloveyou a virus or worm?

VBS/LoveLetter is a VBScript worm. It spreads through email as a chain letter, using the Outlook email application. ILOVEYOU is also an overwriting VBS virus, and it spreads itself using the mIRC (Internet Relay Chat) client as well.

Which is more dangerous virus or worm?

Usually, a worm is more dangerous than a virus, because it can spread more quickly. For example, a worm could infect all of your email contacts.

What are the 4 types of computer viruses?

Common Types of Computer VirusesResident Virus. Resident viruses set up shop in your RAM and meddle with your system operations. … Multipartite Virus. This virus infects the entire system. … Direct Action. … Browser Hijacker. … Overwrite Virus. … Web Scripting Virus. … File Infector. … Network Virus.More items…•

How can you tell if your computer has a virus?

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.Frequent system crashes and/or error messages.Unexpected pop-up windows.More items…•

Who invented the I Love You virus?

Onel De GuzmanIt all started in the Philippines many hours earlier when 24-year-old Onel De Guzman released a virus that he had proposed creating as part of his undergraduate thesis. The key part of the virus was not any technical trick but the wording of the subject line – ILOVEYOU – and its attachment LOVE-LETTER-FOR-YOU.

What does the I Love You virus do?

The worm inflicts damage on the local machine, overwriting random types of files (including Office files, image files, and audio files; however after overwriting MP3 files the virus hides the file), and sends a copy of itself to all addresses in the Windows Address Book used by Microsoft Outlook.

What does a virus do to your computer?

Some computer viruses are programmed to harm your computer by damaging programs, deleting files, or reformatting the hard drive. Others simply replicate themselves or flood a network with traffic, making it impossible to perform any internet activity.

Which is the most expensive computer virus in the world?

The term “malware” applies to viruses, worms, trojan horses, and spyware. The most expensive malware infection to date was the MyDoom worm, which resulted in roughly $38 billion of total damage.

What did the Conficker virus do?

The Conficker worm infected millions of computers including government, business and home computers in over 190 countries, making it the largest known computer worm infection since the 2003 Welchia. Win32:Confi (avast!)

What are the worst computer viruses?

The Top 10 Worst Computer Viruses in HistoryKlez – $19.8 billion. … ILOVEYOU – $15 billion. … WannaCry – $4 billion. … Zeus – $3 billion. … Code Red – $2.4 billion. … Slammer – $1.2 billion. … CryptoLocker – $665 million. … Sasser – $500 million. The Sasser worm was written by a 17-year-old German computer science student named Sven Jaschan.More items…•

What is the strongest virus in computer?

ILOVEYOUILOVEYOU It is considered one of the most virulent computer viruses ever created. It was managed to wreak havoc on computer systems all over the world with around $10 billion worth of damages.

Are there good computer viruses?

The general consensus is that there are no good viruses. By definition, viruses do not have to do something bad. An early (and current) virus researcher, Fred Cohen, has argued that good computer viruses are a serious possibility.

How do you clean viruses off your computer?

If your PC has a virus, following these ten simple steps will help you to get rid of it:Step 1: Download and install a virus scanner. … Step 2: Disconnect from internet. … Step 3: Reboot your computer into safe mode. … Step 4: Delete any temporary files. … Step 5: Run a virus scan. … Step 6: Delete or quarantine the virus.More items…

Is Trojan Horse A virus?

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.

Which is the first computer virus in the world?

The first computer virus, called “Creeper system”, was an experimental self-replicating virus released in 1971. It was filling up the hard drive until a computer could not operate any further. This virus was created by BBN technologies in the US. The first computer virus for MS-DOS was “Brain” and was released in 1986.

Is Bonzi Buddy still a virus?

BonziBuddy was discontinued in 2004 after the company behind it faced lawsuits regarding the software and was ordered to pay fines.