BOOT SECTOR VIRUS
The term “boot sector” is a generic name that seems to originally come
from MS-DOS but is now applied generally to the boot information used by
any operating system. In modern computers this is usually called the
“master boot record,” and it is the first sector on a partitioned
storage device.
BROWSER HIJACKER
This type of virus, which can spread itself in numerous ways including
voluntary download, effectively hijacks certain browser functions,
usually in the form of re-directing the user automatically to particular
sites. It’s usually assumed that this tactic is designed to increase
revenue from web advertisements.
DIRECT ACTION VIRUS
This type of virus, unlike most, only comes into action when the file
containing the virus is executed. The payload is delivered and then the
virus essentially becomes dormant – it takes no other action unless an
infected file is executed again.
FILE INFECTOR VIRUS
Perhaps the most common type of virus, the file infector takes root in a
host file and then begins its operation when the file is executed. The
virus may completely overwrite the file that it infects, or may only
replace parts of the file, or may not replace anything but instead
re-write the file so that the virus is executed rather than the program
the user intended.
MACRO VIRUS
A wide variety of
programs, including productivity applications like Microsoft Excel,
provide support for Macros – special actions programmed into the
document using a specific macro programming language. Unfortunately,
this makes it possible for a virus to be hidden inside a seemingly
benign document.
MULTIPARTITE VIRUS
While some viruses
are happy to spread via one method or deliver a single payload,
Multipartite viruses want it all. A virus of this type may spread in
multiple ways, and it may take different actions on an infected computer
depending on variables, such as the operating system installed or the
existence of certain files.
POLYMORPHIC VIRUS
Another
jack-of-all-trades, the Polymorphic virus actually mutates over time or
after every execution, changing the code used to deliver its payload.
Alternatively, or in addition, a Polymorphic virus may guard itself with
an encryption algorithm that automatically alters itself when certain
conditions are met
RESIDENT VIRUS
This broad virus
definition applies to any virus that inserts itself into a system’s
memory. It then may take any number of actions and run independently of
the file that was originally infected
WEB SCRIPTING VIRUS
Many websites execute complex code in order to provide interesting
content. Displaying online video in your browser, for example, requires
the execution of a specific code language that provides both the video
itself and the player interface.
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Wed Jul 31, 2013 12:58 pm by webmaster
