A virus is a program that copies itself without the knowledge of the computer user. Typically, a virus spreads from one computer to another by adding itself to an existing piece of executable code so that it is executed when its host code is run. If a virus if found, you shouldn't panic or be in a hurry, and you should work systematically. Don't rush!
A Viruse may be classified by it's method of concealment (hiding). Some are called stealth viruses because of the way that they hide themselves, and some polymorphic because of the way they change themselves to avoid scanners from detecting them.
The most common classification relates to the sort of executable code which the virus attaches itself to. These are:
¨ Partition Viruses
¨ Boot Viruses
¨ File Viruses
¨ Overwriting Viruses
As well as replicating, a virus may carry a Damage routine.
There is also a set of programs that are related to viruses by virtue of their intentions, appearances, or users likely reactions. For example:
¨ Droppers
¨ Failed viruses
¨ Packagers
¨ Trojans
¨ Jokes
¨ Test files
ไม่มีความคิดเห็น:
แสดงความคิดเห็น