Computer viruses

• A virus is a computer program which is disturbing your computer work.
• Computer virus infects other programs, infecting them with a virus code.
• from one computer to another.
• Disrupted and slow down the computer work.
• Do not allow to perform some operations.
• Modifies the data.
• Deletes some files.
• Modifies the file system data
• There may be effects, characters, images which were not previously.
• Most important types of the Viruses :
• Trojan horses.
• The real viruses.
• Macro viruses.
• Logic Bombs.
• Time Bombs.
• Worms.
• The hidden viruses.
• Trojan horse
• Trojan horses can also be found in software which one you download for free from internet. Do never download software from unknown internet sources !
• Trojan horses are spread when people are lured into opening a program because they believe that it comes from a trusted source.
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• The real viruses
• Small programs stick to other programs and come to life when an infected program is being prepared to work. They infect other programs.
• Such viruses are difficult to detect because the most infected programs is functioning normally and viruses successfully complete their work.
• Most important this virus goal - his own copies creation.
• Macro viruses
• This kind of viruses attacks and damages the documents created in applications such as word , PowerPoint , excel..
• It sticks to a Microsoft Word or Excel programs documents so that all newly created documents have the virus code.
• Logic Bombs
• This is a program which is activated of a specific logical event, such as., Connect to a network for a new user.
• Time Bombs
• This program start work...

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