Computervirus
- 2. WHAT IS VIRUS ? Computer viruses are small software programs that are designed to spread from one computer to another and to interference in computer operation. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.
- 3. Viruses are most easily spread by attachments in e-mail messages or instant messaging messages. That is why it is essential that you never open e-mail attachments unless you know who it's from and you are expecting it. Once a virus is on your computer, its type or the method it used to get there is not as important as removing it and preventing further infection.
- 4. Viruses can be disguised as attachments of funny images, greeting cards, or audio and video files. Viruses also spread through downloads on the Internet. They can be hidden in illicit software or other files or programs you might download.
- 5. General information about computer virus Different Malware Types. Malware is a general name for all programs that are harmful; viruses, Trojan, worms and all other similar programs. These classifications take into account the different ways in which the virus can infect different parts of a system. The manner in which each of these types operates has one thing in common: any virus has to be executed in order to operate.
- 6. Trojan A Trojan Horse is a program that does something else that the user thought it would do. It is mostly done to someone on purpose. The Trojan Horses are usually masked so that they look interesting, for example a saxophone. Wav file that interests a person collecting sound samples of instruments. According to an administrator of AOL, the Trojan steals passwords and sends an E-mail to the hackers fake name and then the hacker has your account in his hands.
- 7. worm A worm is a program which spreads usually over network connections. Unlike a virus which attach itself to a host program, worms always need a host program to spread. In practice, worms are not normally associated with one person computer systems. They are mostly found in multi-user systems such as Unix environments. A classic example of a worm is Robert Morrisis Internet- worm 1988.
- 8. Other types of virus Bacteria, also known as rabbits, are programs that do not directly damage the system. Instead they replicate themselves until they monopolize CPU, memory or disk space. This constitutes a denial of service attack.
- 9. A bomb is actually a type of Trojan horse that can be used to release a virus or bacteria. Bombs work by causing an unauthorized action at a specified date, time or when a particular condition occurs. There are two types of bombs; logic and time. Logic bombs are set to go off when a particular event occurs. Time bombs go off at a specified time, date or after a set amount of time elapses.
- 10. Salamis cut away tiny pieces of data. They can be particularly dangerous as the damage they do is small and can be attributed to some truncation of the system. It is possible for a salami to do a great deal of damage before it is found.
- 11. HOW VIRUSES ACTIVE? We are always afraid that viruses do something harmful to files when they get active, but not all the viruses activate. Some viruses just spread out, but when viruses activate they do very different things. Might play a part of melody or play music in the background, show a picture or animated picture, show text, format hard disk or do changes to files.
- 12. As an example, in one unnamed company: over a long period of time, the files in a server were corrupted just a bit. So backup copies were taken from the corrupted files. And after they noticed that something was wrong, it was too late to get back the data from the backups. That kind of event is the worst that can happen for the uses.
- 15. CONCLUSION There are lots of viruses in the world and new viruses are coming up every day. There are new anti-virus programs and techniques developed too. It is good to be aware of viruses and other malware and it is cheaper to protect you environment from them rather then being sorry. There might be a virus in your computer if it starts acting differently. There is no reason to panic if the computer virus is found. It is good to be a little suspicious of malware when you surf in the Internet and download files. Some files that look interesting might hide a malware. A computer virus is a program that reproduces itself and its mission is to spread out. Most viruses are harmless and some viruses might cause random damage to data files. A trojan horse is not a virus because it doesn't reproduce. The trojan horses are usually masked so that they look interesting. There are trojan horses that steal passwords and formats hard disks.
- 16. Thank You