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Rogue security software might also display legitimate and important Windows files as infections. Rogue security software can prevent applications, such as Internet Explorer, from opening. They frequently run right after you download them, or the next time that your computer starts. The names of these products frequently contain words like Antivirus, Shield, Security, Protection, or Fixer. What is rogue security software?Ī rogue security software program tries to make you think that your computer is infected by a virus and usually prompts you to download or buy a product that removes the virus.
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Spyware can track Internet search habits and can also redirect your web browser to a different website than you intend to go to. These programs can change your computer’s configuration or collect advertising data and personal information.
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Spyware can install on your computer without your knowledge. They are spread by viruses, worms, or downloaded software.
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Trojan horses do not usually spread by themselves.
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Then it puts code into the operating system that enables a hacker to access the infected computer. It enters a computer hidden inside a legitimate program, such as a screen saver. What is a trojan horse?Ī trojan horse is a malicious software program that hides inside other programs. Worms aren't always destructive to computers, but they usually cause computer and network performance and stability problems. Worms then spread automatically through email messages, networks, or operating system vulnerabilities, frequently overwhelming those systems before the cause is known. The worm uses the addresses to send infected email messages, and frequently mimics (or spoofs) the "From" addresses in later email messages so that those infected messages seem to be from someone you know.
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The worm scans the infected computer for files, such as address books or temporary webpages, that contain email addresses. Most worms begin as email attachments that infect a computer when they're opened. What is a worm?Ī worm is computer code that spreads without user interaction.
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Tip: For information about the symptoms of a computer virus, go to the Microsoft PC Security website. They can be hidden in pirated software or in other files or programs that you might download. Computer viruses also spread through downloads on the Internet. Viruses can be disguised as attachments of funny images, greeting cards, or audio and video files. Therefore, you must never open an email attachment unless you know who sent the message or you are expecting the email attachment. A computer virus might corrupt or delete data on a computer, use an email program to spread the virus to other computers, or even delete everything on the hard disk.Ĭomputer viruses are frequently spread by attachments in email messages or by instant messaging messages. Examples of malware include the following:Ī computer virus is a small software program that spreads from one computer to another and interferes with computer operation. Malware is a term that is used for malicious software that is designed to do damage or unwanted actions to a computer system.
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Some old viruses make sure that the "last modified" date of a host file stays the same when they infect the file.Windows 7 Enterprise Windows 7 Home Basic Windows 7 Home Premium Windows 7 Professional Windows 7 Starter Windows 7 Ultimate More. For example, some can infect files without increasing their sizes, while others try to evade detection by killing the tasks associated with the antivirus software before they can be detected. Some viruses use different stealth strategies to avoid their detection from anti-virus software. Viruses spread when the software or documents they get attached to are transferred from one computer to another using a network, a disk, file sharing methods, or through infected e-mail attachments. Some viruses wreak havoc as soon as their code is executed, while others lie dormant until a particular event (as programmed) gets initiated, that causes their code to run in the computer. However, most of them perform actions that are malicious in nature, such as destroying data. Not all computer viruses are destructive though. It can self-replicate, inserting itself onto other programs or files, infecting them in the process. After entering a computer, a virus attaches itself to another program in such a way that execution of the host program triggers the action of the virus simultaneously. Once created and released, however, their diffusion is not directly under human control. Definition: A computer virus is a malicious software program loaded onto a user’s computer without the user’s knowledge and performs malicious actions.ĭescription: The term 'computer virus' was first formally defined by Fred Cohen in 1983.