A Windows worm first discovered in , it was created by computer science student Sven Jaschan, who also created the Netsky worm. While the payload itself may be seen as simply annoying it slows down and crashes the computer, while making it hard to reset without cutting the power , t he effects were incredibly disruptive, with millions of computers being infected, and important, critical infrastructure affected.
The worm took advantage of a buffer overflow vulnerability in Local Security Authority Subsystem Service LSASS , which controls the security policy of local accounts causing crashes to the computer. It will also use the system resources to propagate itself to other machines through the Internet and infect others automatically.
This led to more than a million infections , taking out critical infrastructures, such as airlines, news agencies, public transportation, hospitals, public transport, etc. Jaschen was tried as a minor and received a 21 month suspended sentence.
Zeus is a Trojan horse made to infect Windows computers so that it will perform various criminal tasks. The most common of these tasks are usually man-in-the-browser keylogging and form grabbing. The majority of computers were infected either through drive-by downloads or phishing scams.
First identified in , it managed to compromise thousands of FTP accounts and computers from large multinational corporations and banks such as Amazon, Oracle, Bank of America, Cisco, etc. Controllers of the Zeus botnet used it to steal the login credentials of social network, email and banking accounts.
The entire operation was sophisticated, involving people from around the world to act as money mules to smuggle and transfer cash to the ringleaders in Eastern Europe. In late , the creator of Zeus announced his retirement but many experts believe this to be false. Also known as Downup or Downadup , Conficker is a worm of unknown authorship for Windows that made its first appearance in The name comes form the English word, configure and a German pejorative.
It infects computers using flaws in the OS to create a botnet. The malware was able to infect more than 9 millions computers all around the world, affecting governments, businesses and individuals. The worm works by exploiting a network service vulnerability that was present and unpatched in Windows. Once infected, the worm will then reset account lockout policies, block access to Windows update and antivirus sites, turn off certain services and lock out user accounts among many.
For more info, see What is SmartScreen and how can it help protect me? Pay attention to Windows SmartScreen notifications - Be cautious about running unrecognized apps downloaded from the Internet. Unrecognized apps are more likely to be unsafe. When you download and run an app from the internet, SmartScreen uses info about the app's reputation to warn you if the app isn't well-known and might be malicious.
Keep Windows updated - Periodically, Microsoft releases special security updates that can help protect your PC. These updates can help prevent viruses and other malware attacks by closing possible security holes. Windows Update helps to make sure that your PC receives these updates automatically, but you may still have to restart your machine occasionally for the updates to install completely.
Use your internet browser's privacy settings - Some websites might try to use your personal info for targeted advertising, fraud, and identity theft. All modern browsers have privacy settings that you can enable to control what sites can see or do.
For more information about configuring the privacy settings in Microsoft Edge see Configure your privacy settings so they're right for you. UAC can help keep viruses from making unwanted changes. To open UAC, swipe in from the right edge of the screen, and then tap Search. If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search.
Enter uac in the search box, and then tap or click Change User Account Control settings. Make sure that Tamper Protection is turned on - In Windows 10 and 11 we have a feature called Tamper Protection that prevents unauthorized apps from changing your security settings. In the results area, click Windows Update.
Click Check for Updates. Follow the instructions to download and install the latest Windows Updates. Restart your computer. When you see the computer's manufacturer's logo, repeatedly press the F8 key. Click the Shortcut tab. Click Open File Location. Right-click the folder, and then click Delete. Click the Download Now button, and then click Run.
Follow the instructions to scan your computer and help remove the rogue security software. Click the Start button, and then click Control Panel. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. No jargon. Pictures helped. Didn't match my screen. Incorrect instructions. Too technical. Not enough information.
Sasser was so effective it actually ground one third of the post offices in Taiwan to a halt, shut down branches of a Finnish bank, and forced rail and transatlantic flights to be cancelled. Quite a lot, as it so happens. So in the early to mid-noughties, Anna Kournikova was one of the most searched terms on the internet. People were just very into tennis. The mayor of the town came forward and said the city should be proud to have produced such a talented young man and offered him a job as a techie once he was finished his education.
While most of the malware on this list strictly hit computers, Slammer was created with broader ambitions. Slammer is the kind of virus that makes it into films, as only a few minutes after infecting its first victim, it was doubling itself every few seconds. Slammer, quite aptly, caused a huge panic as it had effectively managed to crash the internet in 15 quick minutes. Stuxnet is easily the scariest virus on the list as it was built by government engineers in the US with the intention of obstructing nukes from being built in Iran.
Stuxnet spread by a USB thumb drive and targeted software controlling a facility in Iran that held uranium. Stuxnet is the first real venture into cyberwar and it definitely asks the question as to what will come next. So there you have it: while viruses and malware might seem like a myth drummed up by tech companies, they are a very real threat that have caused billions in damage.
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