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March 2, 2015
No of pages / words:
2 / 392
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Once installed on a computer, a virus may change or remove application and system files. Some viruses can leave a computer inoperable; others just display startling screen messages to innocent users.
Here are five common types of viruses:
Trojan Horse Viruses
A Trojan Horse are computer viruses that hide inside non-executable files such as compressed or document files and executable files and try to avoid detection by anti-virus programs such as Norton or McAfee...
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Trojan Horses usually appear to be useful computer files / programs such as a computer game or data library.
A polymorphic virus is an encrypted virus that hides itself from anti-virus through scrambled data and then decrypts itself to be able to spread through the computer. The thing that makes it hard for anti-virus software to detect polymorphic viruses is that the virus creates and totally new decryption routine each time it infects a new executable file, making the virus signature different in each signature...
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