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virus is a computer program (.exe, .cmd or .bat etc file) that makes their own copy and infects a computer. Some of the types, like malware, adware, and spyware etc , these can not make their own copy. A virus can travel from one computer to another in a .exe code. It can also travel from network to network and internet. It can be carried in floppy disk, CD, DVD, or USB drive.
Symptoms of a computer virus
The computer runs slower than usual. The computer stops responding, or it locks up frequently. The computer crashes, and then it restarts every few minutes. The computer restarts on its own. Additionally, the computer does not run as usual. Applications on the computer do not work correctly. Risks or disk drives are inaccessible. You cannot print items correctly. you see unusual error messages. you see distorted menus and dialog boxes. here is a double extension on an attachment that you recently opened, such as a .jpg, .vbs, .gif, or .exe. Extension. n antivirus program is disabled for no reason. Additionally, the antivirus program cannot be restarted. An antivirus program cannot be installed on the computer, or the antivirus program will not run. New icons appear on the desktop that you did not put there, or the icons are not associated with any recently installed programs. Strange sounds or music plays from the speakers unexpectedly. A program disappears from the computer even though you did not intentionally remove the program.
2009 top ranked virus
This virus is a network worm and exploits the RPC sub-system vulnerability present in the Microsoft Windows operating system, allowing an attacker to remotely attack a computer without valid user credentials. Win32/Conficker infects the computer using unsecured folders, removable medium or by making use of Autorun facility enabled by default in windows. This threat contacts other domain names to download additional malicious code.
Letââ‚¬â„¢s talk about Computer Viruses, Spam, Spyware, Dialers, Hijackers and some of the other threats that make trouble for you. I assume that most of them who are using the internet regularly have had one or more "troublemaker" sneaking through their cables and into their computers. I call it "troublemakers", because trouble's all they want. If we talk about ethics when it comes to creation of online threats, whether it's a joke, a dangerous virus, or even a spam email, they have a profitable, educational, innocent or critical plan. Some just want to gather general information to learn.Some are critical, and some wants to find your confidential data.(such as bank account information, your credit card number etc.) By saying this I just want you to be aware of that some threats you can easily deal with, but others you just don't want at all. Personally I think there are ethics that are followed when creating online threats. But these ethics are only followed by the ethical people. There are all kinds of people on this planet, and most people are good enough, but there will always be people with spiteful intent and blazing wishes of making the most difficulty for other people. They exist on the internet as well. Think of people that are making these viruses and trojans. A person is sitting in his computer and developing a dangerous virus for destorying otherââ‚¬â„¢s computers, what kind of happiness virus makers gets happy when they get to know that people are loosing their money, their important documents, and time with their virus. What I mean to say , you must be conscious of viruses, whether its not your fault if they are infected your important documents. There are dangerous threats that you should treat with fear and caution. Your computer must be protected with a secure antivirus, interent security and firewall protction. These days a computer virus can hijack not just your hard drive but also your online identity. Twitter and Facebook users are often mortified to learn that viruses have stormed their accounts, sending out messages to all their friends and followers. And all the more embarrassing when co-workers and loved ones who trust you fall for malicious programs cloaked as video links or online tests. One of the largest viruses ever discovered has hit more than 75,000 computers worldwide, targeting email, credit card information, corporate data and logins at health and tech companies in 196 countries. The attack, originating from a crime ring based in Eastern Europe, shows that criminal groups are becoming as sophisticated in their cyberattacks as nation states such as China and Russia, the Washington Post reports. The attack, which began in late 2008 and was discovered last month, tricked unsuspecting computer users at the targeted companies into downloading infected software or opening emails with infected attachments. A malicious software intrusion called the Kneber bot then trolled users' computers for log-in information and passwords, which it used to get into other users' systems, multiplying its attack exponentially. The log-in data the hackers gathered has monetary value in the criminal world. Computer viruses actually work in much the same waySome computer viruses are barely perceptible, not strong enough to do any real damage and the virus protection on your computer, much like your own immune system, will do away with it without you even knowing about it. Some viruses are more serious, like the common cold. They can cause problems and severe discomfort, but are not life threatening. On the extreme end of the spectrum are the viruses like HIV, viruses that can kill you.ÃÂ¯These computer viruses can cause a complete system failure, erasing memory and crashing the computerThere is another important distinction between natural viruses and computer viruses. Common colds and the like are biological, serving some evolutionary purposes. No malicious being created viruses. Computer viruses, on the other hand, are created by malicious people who have no purpose other than to harm people and their computers.Code Red, Nimda and the Melissa virus have all wreaked havoc on businesses around the world, costing billions of dollars. The reason for this is simple: the Internet is inherently insecure. Internet was originally designed for military communication and not for the commercial purpose. Nobody at that time would have dreamed that Internet and online communication would become that popular and widely adopted. Today, viruses are one of the most predominant security problems plaguing the Internet.ÂÂ Fortunately all the bugs and viruses that make it to the news, like the "I Love You" virus of a couple years ago can be defeated by a few intelligent programmers and careful use of e-mail. It is therefore extremely important to protect yourself, your company, and your friends and family against viruses and the people who create them.