Computers

Chapter 14 computer viruses

1 Types of viruses
Virus sense of touch
A virus signature describes a virus.
Can include the following:
length
show names
dash of infection or replication
the areas of the system that are attacked
name or length of file attachment
Used by antivirus programs to detect viruses.

Virus classifications
Worm- A worm is replicated onto one computer and infects its files. Spreads itself automatically to new(prenominal) computers without prompting from the user.
Trojan horse- appears as a free gift, such(prenominal) as a free download. Activates when opened. Can cause flying damage or damage at a posterior date.
Macro virus- A big virus is created with a macro programming language.
MBR virus- An MBR virus attaches to the master boot record (MBR).
super destructive. MBR peck be rebuilt if a backup is made.
Logic Bomb- a logic bomb is shipped into an application. Lays dormant until some event takes place. Gives virus time to spread to other computers.
Back doorway virus- A back door virus creates a back door into a computer and goes undetected. Used to breach security.
Password virus- a password virus is designed to breach security care the back door virus. Steals passwords. Sometimes used in crew with a back door virus.
Stealth virus- hides from normal detection.



Incorporates itself into sectionalization of a known, typically required, program. Difficult to acquire its signature.

Polymorphic virus- changes as it evolves. Can randomly change its program length, location, and type of file to infect.
hoax- is a false message spread about a real or unreal virus.
Harmful In that it can cost a company money due to a loss
2 well- known viruses
Michelangelo- Logic bomb toughened for march 6th, 1992. Wipes out data on the hard drive.
Melissa- appeared In march of 1999. Macro email virus. Sends infected message to starting signal 50 people on users microsoft observation post mail list. Could send any document from your PC.
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