What Is the Most Dangerous Computer Virus?

Computer Coding

A pc virus is a malicious code or program that alters your pc working system. A pc virus works by attaching or inserting itself right into a reliable doc or program in your pc that helps macros to execute its code. However, all pc viruses aren’t the identical, and a few are extra harmful than others. So, what’s the most harmful pc virus? 

Quick Answer

There are hundreds of pc viruses, however one in all the most harmful of all occasions is Mydoom. Other worst pc viruses in historical past embody Sobig, Klez, ILOVEYOU, WannaCry, and so on. 

A virus may be in your pc with out you even understanding. Also, some viruses can keep dormant with no indicators or signs; some will infiltrate your pc and steal delicate info like your password by logging keystrokes, corrupt information, spam your e mail contacts, and so on.

There was a time when viruses had been a factor that price many individuals and organizations billions as a result of antivirus wasn’t as superior as they’re now. 

Continue studying this text to find out about a few of the worst pc viruses in historical past on this article. 

Table of Contents

  1. Some of the Worst Computer Viruses of All Time 
    • Virus #1: Mydoom 
    • Virus #2: Sobig 
    • Virus #3: Klez 
    • Virus #4: ILOVEYOU 
    • Virus #5: WannaCry 
    • Virus #6: Zeus 
    • Virus #7: Code Red 
    • Virus #8: Slammer 
  2. Conclusion 

Some of the Worst Computer Viruses of All Time 

There are a number of varieties of pc viruses. Some of the most typical pc viruses are net scripting, browser hijacker, overwrite, resident, and so on. These viruses can get into your pc by way of your e mail, net browser, USB, and so on. 

While you possibly can shield your pc from a virus or malware assault through the use of an antivirus or avoiding suspicious web sites or hyperlinks, viruses generally discover their approach to your pc regardless of being very cautious. 

Below are a few of the worst pc viruses of all time. 

Virus #1: Mydoom 

Mydoom, often known as Novarg, is technically a malware worm that’s unfold by mass emailing. Mydoom is one in all the worst viruses in historical past, because it brought on estimated injury of $38 billion in 2004. And if we had been to regulate for inflation, that ought to quantity to roughly $52.2 billion as we speak.

When Mydoom will get on a tool, it infects it after which sends copies of itself to different e mail addresses on the pc and infects these computer systems. In different phrases, the Mydoom virus contaminated the pc into an online of computer systems known as a botnet which performs DDoS assaults supposed to close down a goal server or web site. 

Virus #2: Sobig 

Another well-known pc virus is the Sobig of 2003. This pc virus can be a worm-like malware that prices over $30 billion in injury worldwide, together with in Asia, Europe, the US, the UK, and Canada. There had been a number of variations of the virus in circulation, akin to the Sobig.A by way of to Sobig.F, the place Sobig.F was the worst

When a pc is contaminated with Sobig, it camouflages itself as reliable pc software program by attaching itself to emails. Its unfold was so extreme that it disrupted ticketing at Air Canada and a number of other different companies. And regardless of its widespread injury, authorities by no means caught its creator. 

Virus #3: Klez 

Klez is one other pc virus thought of the third worst globally. It price practically $20 billion in injury and contaminated over 7.2% of computer systems in 2001. The Klez malware additionally posed as a faux e mail, infecting the pc, copying itself, and spreading to different PCs.  

Like different worms and viruses, Klez was additionally launched in a number of variants. This malware hung round for years, with every new model being extra damaging than the final. Windows has come a great distance since then, and the built-in Microsoft Defender can shield towards viruses like this. 

Virus #4: ILOVEYOU 

Another well-known virus is the ILOVEYOU virus which grew to become common in the 2000s and value over $15 billion in injury. However, like Mydoom, this file assaults the PC, copies itself, and sends itself to different e mail addresses in the contaminated pc contact record. 

Shortly after its launch in May, it unfold to over 10 million PCs. This virus was created by a Philippine school scholar Onel de Guzman, who wrote the code to steal passwords for on-line companies he needed to make use of without spending a dime. 

Virus #5: WannaCry 

WannaCry is a ransomware pc virus that made its rounds on the web in 2017. When this virus infects a pc, it takes over and holds it hostage. This ransomware affected over 150 nations resulting in losses in productiveness, affecting hospitals, authorities organizations, companies, and so on. 

This virus led to a $4 billion loss for organizations, forcing them to rebuild their system. This malware ranged like wildfire till a safety researcher from the UK discovered a approach to shield computer systems from it. 

Virus #6: Zeus 

Zeus is one other pc virus that hit the net in 2007. It is an internet theft device that results in over 44% of all financial institution malware assaults. About 88% of all Fortune 500 firms and 2500 organizations in round 196 nations had been affected by this virus. 

The Zeus virus originated from Eastern Europe and was used to transfer cash to secret financial institution accounts. The Zeus assault led to over $100 million of documented injury. But the precise price of injury attributable to discount in productiveness, undocumented theft, and so on., is undoubtedly over the $3 billion estimate

Virus #7: Code Red 

Code Red is one other pc virus that first got here to gentle in 2001. It is a worm-like malware that infiltrated virtually 1 million hosts. When a pc is contaminated with this virus, the contaminated web page could have the phrases “Hacked by Chinese” displayed. 

When the Code Red virus infects a pc, it leaves no hint in the arduous drive or different storage. This virus was primarily focused at web sites and delivered as a DDoS assault. On common, this virus causes loads of monetary loss, which is pegged at round $2.4 billion

Virus #8: Slammer 

Slammer is a pc virus that surfaced in 2003 and was in a position to unfold over 200,000 computer systems. It makes use of its victims’ computer systems to launch a DDoS assault, considerably slowing web site visitors. The SQL Slammer randomly selects IP addresses, exploits their vulnerability, and sends itself to different computer systems that hook up with that pc. 

The Slammer virus hits the Canadian and US banks, taking their ATM offline in a number of areas. In Toronto’s Imperial Bank of Commerce, they couldn’t entry funds. The Slammer assault resurfaced in 2016 and was launched from IP addresses in Mexico, China, and Ukraine. Overall, this virus led to over $1.2 billion in injury

Keep in Mind

While viruses and worms injury your pc, they’re fairly totally different. A worm is self-contained and runs, copies, and sends copies of itself to different computer systems, whereas a virus wants one other program to work, akin to an online browser.


As you possibly can see, pc viruses are harmful and might trigger critical issues. It could make you lose your information, tools, and even cash. Although you possibly can simply detect if there’s a virus in your PC as we speak attributable to technological development, issues weren’t as straightforward again in the day.

If you’ve an antivirus in your PC, a file, or a web site that possesses any safety menace, the antivirus will warn you instantly. However, in case you are unlucky to get a virus in your PC, you possibly can eliminate it by scanning your PC with antivirus and eradicating corrupted information. 

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