Top 10 Most Dangerous Cyber Viruses of All Time

Cyber viruses come in all shapes and sizes, with new ones being created every day. Some are more dangerous than others, however, and can cause serious damage to your computer or even your whole network.

Here are some of the most dangerous cyber viruses of all time:

In this article, we will be discussing the most dangerous cyber viruses of all time.

1. ILOVEYOU

This destructive virus first reared its ugly head in 2000, wreaking havoc on computers around the globe. The ILOVEYOU virus was spread via email, with infected messages masquerading as love letters from admirers. Once opened, the virus would proceed to overwrite important files and send itself out to everyone in the victim’s address book. Tens of millions of people were affected by ILOVEYOU, with damages estimated to be in the billions of dollars.

2. Sasser

Sasser appeared in 2004 and quickly spread across the internet, infecting hundreds of thousands of computers running Microsoft Windows. The worm took advantage of a vulnerability in the operating system’s Local Security Authority Subsystem Service (LSASS), allowing it to gain unauthorised access and take control of the machine. Sasser caused widespread disruption, with many organisations forced to shut down their networks in order to contain the threat.

3. Mydoom

Mydoom first surfaced in 2004 and is believed to be responsible for causing the biggest ever denial-of-service attack. The virus was spread via email attachments and infected computers would then proceed to bombard a predefined list of websites with requests, effectively shutting them down. Mydoom also had a secondary payload which attempted to steal sensitive information such as passwords and credit card details.

4. Storm Worm

The Storm Worm first appeared in 2007 and quickly became one of the most widespread malware threats in history. The worm was spread via email attachments and infected computers would then become part of a botnet, which could be used to launch denial-of-service attacks or send out spam emails. Storm Worm was particularly notable for its sophisticated social engineering techniques, which trick users into opening the malicious attachment.

5. Conficker

Conficker first appeared in 2008 and quickly spread to millions of computers around the world. The worm took advantage of a vulnerability in the Windows operating system and once installed, allowed attackers to gain unauthorised access to the machine. Conficker also had the ability to disable security features and install other malicious software on the infected machine. The worm caused widespread disruption, with many organisations forced to shut down their networks in order to contain the threat.

6. Stuxnet

Stuxnet is a piece of malware that first appeared in 2010 and is widely believed to be the world’s first cyber weapon. The worm was designed to target industrial control systems, specifically those used in Iran’s nuclear facilities. Stuxnet caused significant damage to Iran’s nuclear program and is thought to have set back their efforts by several years.

7. Flame

Flame is a piece of malware that was discovered in 2012 and is believed to be one of the most sophisticated pieces of malicious software ever created. The worm was designed to steal sensitive information such as passwords and credit card details, as well as eavesdrop on victim’s conversations. Flame is thought to have been created by a nation state and targeted computers in Iran, with many believing that it was part of a wider cyber warfare campaign against the country.

8. Red October

Red October is a piece of malware that was discovered in 2013 and is believed to be one of the most sophisticated pieces of malicious software ever created. The worm was designed to steal sensitive information such as passwords and credit card details, as well as eavesdrop on victim’s conversations. Red October is thought to have been created by a nation state and targeted computers in Russia, with many believing that it was part of a wider cyber warfare campaign against the country.

9. Cryptolocker

Cryptolocker is a piece of malware that first appeared in 2013 and quickly became one of the most feared pieces of malicious software. The worm encrypts victim’s files using a strong encryption algorithm, making them inaccessible. Cryptolocker then demands a ransom be paid in order to decrypt the files, with many victims choosing to comply as they have no other way to access their data.

10. WannaCry

WannaCry is a piece of malware that first appeared in 2017 and quickly spread to hundreds of thousands of computers around the world. The worm took advantage of a vulnerability in the Windows operating system, allowing it to gain unauthorised access to the machine. WannaCry then encrypts victim’s files using a strong encryption algorithm, making them inaccessible. WannaCry then demands a ransom be paid in order to decrypt the files, with many victims choosing to comply as they have no other way to access their data.

WannaCry is notable for being one of the first major malware threats to utilise a technique known as “ransomware-as-a-service”, which allows anyone to distribute the malware in return for a percentage of the ransom payments. This model proved to be extremely profitable for the attackers, with estimates suggesting that they made over $140 million from the scheme.

These are just some of the most dangerous cyber viruses of all time. Cybersecurity is an ever-evolving field and it’s important to stay up-to-date on the latest threats in order to protect yourself and your organisation.