Computer viruses or malware when infect a PC/s can cause a nightmare to its users for weeks or sometimes months. Their aim is to corrupt user machines making it helpless and sick. Some viruses can be cleaned up by using a simple anti-virus program. But some can cause a complete disaster, thereby turning a user PC into a mess that no anti-malware program can protect.
Here’s the list of five most dangerous computer viruses of all time.
Code Red- This malware spread was caused by a server flaw of Microsoft Internet Information server. Code Red spread on the network servers in 2001 causing $2.6 billion dollars damage by hitting almost one million PCs. And in less than a year’s time, the virus brought down over 400,000 servers that included the White House web server as well. Code Red malware spread was probed by FBI and it was found that this virus was induced into the network by a group of Chinese hackers.
ILOVEYOU- This virus which hit the PCs connected via internet throughout the world in the year 2000 caused $10 billion damage. The virus which originated in Philippines got transmitted via email links, which was a radical human emotion that no one can ignore at that time. The virus hit the PCs in the form of a normal text file and when the email link was opened by a recipient, the attachment activated the Visual Basic script. The worm damaged the local machines, overwriting image files, and sent a copy of it to all addresses listed in the Windows Address book used by Microsoft Outlook. Things have changed a lot nowadays …..Isn’t it?
Melissa- Mellissa virus hit the news headlines in March 26, 1999, when it spread like an email attachment by the name “List.doc”. It was built by David L and PC industry with the virus spread through email attachments. Later on, FBI arrested David L and slapped him with a fine of $5000 for creating the wildest virus of its time, which caused a $6 billion worth damage on a worldwide note.
MY Doom- In the year 2004, “My Doom” virus hit the world infecting around two million PCs worldwide. It was a malware which instigated tremendous denial of service attack. It transmitted itself in the form of a bounced error message which read “Mail Transaction failed”. However, as soon as the receiver clicked upon the message the attached executed and the worm transmitted to email addresses found in the user’s address book. Daily Mail reported that this mailer worm caused a damage of almost $38 billion.
Sasser- This was a Windows worm that was discovered in 2004. Apparently, it would slow down and crash the PC, making it even hard to reset without cutting the power. And its effects were surprisingly troublesome as well, with millions of PCs being infected and crucial, significant infrastructure affected. The worm played on a buffer overflow susceptibility in Local Security Authority Subsystem Service (LSASS) that monitors the safety policy of local accounts causing crashes to the PC. The devastating effects of the virus were massive resulting in over a million infections. This included critical infrastructures, such as new agencies, hospitals, airlines, and public transportation.
Note- If you have info on malware spread which caused severe financial damage than above said, please include it in the comments section. The details will be updated into this blog article, along with your name and profession, if found genuine.