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Different kinds of computer virus
Computer virus
A computer virus is a program that "infects" computer files, usually executable programs, by inserting
a copy of itself into the file. These copies are usually executed when the infected file is
loaded into memory, allowing the virus to infect other files. Unlike the computer worm, a
virus requires human involvement (usually unwitting) to propagate.
Trojan horse
A Trojan horse is a computer program that conceals harmful code. It usually masquerades as a useful program
that a user would wish to execute.
Computer worm
A worm is an independent computer program that reproduces by copying itself from one system to another across a network. Unlike computer viruses, worms do not require human involvement to propagate. A logic bomb is a form of
sabotage in which a programmer inserts code that causes the program to perform a destructive action when some triggering event, such as termination of the programmer’s employment, occurs. A sniffer, synonymous with packet sniffer, is a program that intercepts routed data and can be used to examine each packet in search of specified information, such as passwords transmitted in clear text.
Polymorphic, metamorphic, and entry-point-obscuring viruses
Antivirus software provides protection against viruses and worms. However, polymorphic, metamorphic, and entry-point-obscuring viruses are reducing the effectiveness of traditional antivirus scanning techniques.
These techniques are also often used to infiltrate and hide code in a victim’s computer as a base for further criminal activity. Combating these types of viruses requires diligence in maintaining updated antivirus products that employ algorithms to detect these new threats.
Polymorphic virus
Polymorphic viruses are self-mutating viruses that use encryption. Specifically, a small decoder, which changes periodically, decrypts the viruses’ main bodies prior to execution.
Metamorphic virus
Metamorphic viruses change the actual code of the virus between replications, resulting in significantly different patterns, thus causing it to be undetected by the signature-based tool.
Entry-point-obscuring virus
Entry-point-obscuring viruses are making detection more difficult by placing the malicious code in an unknown location.
Blended threats are an increasing risk, especially to organizations. An increase in the number of blended threats is noticed, as well as increasingly destructive payloads. Such threats combine the characteristics of different types of malicious code, such as viruses, worms, Trojan horses, and spyware.
You'll find here information about a really popular antivirus and protection tool:
Info on The Shield DeLuxe Software PC Protection
Other tools to mention here are:
Protecting for online threats:
Symantec Norton Internet Security 2009 Suite
Blocking viruses and spyware:
Symantec Norton AntiVirus 2009
All-in-One Security comprehensive, automated protection:
Symantec Norton 360 Version 2.0
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About Portable Antivirus software
This small anti virus is capable of removing certain variants of virus, Trojans, ad-ware and spy ware from your computer. It’s free to use, and free to distribute. This small anti virus is built to detect and remove viruses that currently spread in the wild. It won’t detect all viruses (such as old 80’s viruses). Besides, it’s almost impossible for a virus from that period to infect a PC that’s running an NT-based system, e.g. Windows XP or Vista. It would not be considered wild at any rate, perhaps a lab-created experimental virus only and would not represent a serious risk globally.
Download latest Portable Antivirus
On this virus of computer subject there will be more here on main types of computer viruses, a list of current viruses,
free virus scanner downloads, discussion about computer virus protection and repair, free online virus cleaner, mcAfee, AVG, Norton, Kaspersky, Avast, panda virus online scan, trojan virus remover and more...
Info is subject of change.
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Flawed AVG antivirus update cripples Windows XP PCs
Nov.11'08 According to messages on AVG's support forums and its own support site, an update released late Saturday for the company's security software fingered the "user32.dll" file as a Trojan horse. As per the program's settings, the AVG software, including the newest version 8.0 and its predecessor 7.5, shut the .dll away in quarantine. The result: A crippled computer.
Here's more
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