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Virus Scan: How it Works

Virus Scan: How it Works

What is a Computer Virus?

A computer virus is a disruptive computer program that infects a computer or operating system from performing its basic functions. Dissimilar to the generic forms of malicious software, a computer virus reproduces and replicates. 


This characteristic enables the virus to transfer from one platform to another. As a result of this function, a computer virus is held separately from generic computer problems, such as adware and spyware programs.


The presence of a computer virus can be damaging, not just to the tangible computer or network, but to the safety of personal and critical information that is typically stored on an operating system. 


What is a Virus Scan?


To disinfect a computer, an individual must download or purchase a virus scan program or various forms of antivirus software. A virus scan is a computer program that, when installed, will sweep the computer’s files and network to reveal any malicious software or coding abnormalities. The typical virus scan will implement a number of identification methods to pinpoint which files are infected. After identifying the damaged files, a virus scan program will disinfect the computer.  


How does a Virus Scan Identify the Problem? 


A virus scan will utilize several identification methods to detect computer viruses or malicious software. The most common identification method, known as a signature-based detection, will identify viruses and other malware by comparing the signatures of such software with the contents of a dictionary that stores virus signatures. 


In essence, if the signatures detected match those in the dictionary, the virus scan will reveal and subsequently disinfect the problems. Although this identification method is effective, it is susceptible to the formation of new viruses where the attached code is not present in the virus scan’s dictionary. To counter this problem, the majority of virus scan software will implement updates to account for the new virus signatures.  


Other methods employed by a virus scan will include more sophisticated approaches, such as a heuristics analysis. Heuristics analysis identifies new malware or variants of known malware through the use of a single virus definition. 


This type of virus scan will not use a dictionary to match exact matches, but will incorporate various complex signatures to terminate families of viruses. Although it is particularly advantageous to identify a specific virus, it can be easier to detect a virus family through a generic signature or through an inexact match to an existing signature. 


This form of virus scan is successful because virus researchers and programmers find common areas that all viruses in a family share uniquely. Through this presence the software can create a generic single signature. These signatures will contain non-contiguous code attached with wildcard characters. These characters will allow the virus scan to detect malware or viruses even if they are padded in meaningless layers of code.  


A virus scan can also search for rootkits, which is a type of malware designed to gain administrative control over a computer system without being detected. Rootkits ultimately change how an operating system functions and can tamper with an anti-virus program to render it ineffective. 


Discover The Facts About Free Antivirus

Discover The Facts About Free Antivirus

What is Anti-Virus Software?

 

Anti-Virus Software is a computer program that is used to prevent,
detect and subsequently remove various forms of malware, including computer
viruses, computer worms, Trojan horses, adware, and spyware. The programs can
be purchased in computer stores or downloaded through the Internet. 


Anti-virus software may be purchased and installed or downloaded
from the Internet to disinfect a user’s computer. Anti-virus software will
incorporate various programs and techniques to identify the presence of
malicious software or computer viruses. These forms of software may damage a
computer or compromise personal information stored on a system.
 


What is a Free Antivirus Download? 


A free antivirus download enables a user to obtain anti-virus
software without paying for the product. That being said, free anti-virus
software is typically limited. A free anti-virus download will not be equipped
with an updated platform or possess the full range of features found in a
paid-for version.
 


A free anti-virus download is typically made available to test a
product’s effectiveness in removing malware. For instance, the leaders in the
market (McAfee and Norton) will offer trial runs in the form of free anti-virus
software to scan a computer’s system and reveal what areas are infected. The
free anti-virus download, in most instances, will not remove the viruses or
infections, but instead will simply point them out. To disinfect the computer
the individual would then have to purchase the full program. 


In addition to the limited removal of viruses, a free anti-virus
program will not update itself, rendering it incapable of detecting new strands
or formations of viruses which possess undetected codes. 


Free Anti-Virus Identification Methods


To identify the presence of malicious software on a computer
platform, a free anti-virus program will institute an assortment of techniques
and technologies to pinpoint abnormal or disruptive behavior. 


Signature-based detection is the most generic identification
method incorporated by an anti-virus program. To identify malicious software
and computer viruses, anti-virus software will compare the contents of a file
to a dictionary of virus signatures. Due to the fact that viruses can be latent
in existing files, the entire file is searched as a whole and in fragments.
 


As new viruses are being created each day, the signature-based
detectio
n approach requires constant updates of the virus signature dictionary.
To achieve constant and thorough updates, anti-virus software companies will
typically allow the user to upload new variants to the software, allowing new
viruses to be analyzed and the attached signature to be added to the
dictionary. 
 


As a result of the different forms of viruses that can be placed
on a computer, a variety of strategies are typically employed in a basic anti-virus
software program. A signature-based detection anti-virus program will
incorporate a search of the system’s hardware. The search is performed to
evaluate known patterns of data within executable codes. That being said, this
form of anti-virus software is susceptible to newer malware for which no
signature is known.
 


To counter this problem (known as zero-day threats) forms of
anti-virus software, known as heuristics, can be employed. A generic signature,
a type of heuristic approach, can effectively identify new computer viruses or
variations of existing viruses by searching the system for malicious code or
variations of such code. 
 


Another type of Heuristic-based detection system incorporated by
anti-virus software is file emulation. This process involves executing a
program in a virtual environment and logging specific actions the program
performs. Depending on the actions present, the anti-virus software can
determine if the program is malicious or not. If the anti-virus software finds
malicious programming, it will carry out appropriate disinfection
actions. 

Quick and Easy Guide to Anti Virus

Quick and Easy Guide to Anti Virus

What is Anti Virus Software?
Anti-Virus Software is a form of computer program that is used to prevent, detect and subsequently remove various forms of malware, including computer viruses, computer worms, Trojan horses, adware, and spyware.  
Anti-virus software may be purchased and installed or downloaded from the Internet to disinfect a user’s computer. 
Anti-virus software will incorporate various programs and techniques to identify the presence of malicious software or computer viruses. These forms of software may damage a computer or compromise personal information stored on a system.


What is Malware?
Malware, which is short for malicious software, is a type of software that is specifically designed to harm or infiltrate a computer system without the owner or user’s informed consent. Malware will incorporate a variety of computer viruses or specific program inhibitors, such as generic computer viruses, Trojan horses, worms, spyware, scareware, and adware. Malware is regarded as the most common mechanism to initiate Internet crime.
What is a Computer Virus?
A computer virus is a computer program that infects an operating system or computer. The term “virus” is held separately from other types of malware, including adware and spyware programs that do not possess the reproductive ability of a computer virus. A traditional computer virus can spread from one computer or system to another (the virus is spread in some form of executable code) particularly when its host is taken to the target computer. For instance, if the virus is uploaded through a removable medium, such as a floppy disc, a DVD, a USB drive, or a CD.

Anti-Virus Identification Methods
To identify the presence of malicious software on a computer platform, an anti-virus program will institute an assortment of techniques and technologies to pinpoint abnormal or disruptive behavior. 
Signature-based detection is the most generic identification method incorporated by an anti-virus program. To identify malicious software and computer viruses, anti-virus software will compare the contents of a file to a dictionary of virus signatures. Due to the fact that viruses can be latent in existing files, the entire file is searched as a whole and in fragments. As new viruses are being created each day, the signature-based detection approach requires constant updates of the virus signature dictionary.
To achieve constant and thorough updates, anti-virus software companies will typically allow the user to upload new variants to the software, allowing new viruses to be analyzed and the attached signature to be added to the dictionary. 
As a result of the different forms of viruses that can be placed on a computer, a variety of strategies are typically employed in a basic Anti-Virus software program. A signature-based detection anti-virus program will incorporate a search of the system’s hardware. The search is performed to evaluate known patterns of data within executable codes. That being said, this form of anti-virus software is susceptible to newer malware for which no signature is known.
To counter this problem (known as zero-day threats) forms of anti-virus software, known as heuristics, can be employed. A generic signature, a type of heuristic approach, can effectively identify new computer viruses or variations of existing viruses by searching the system for malicious code or variations of such code. 
Another type of Heuristic-based detection system incorporated by anti-virus software is file emulation. This process involves executing a program in a virtual environment and logging specific actions the program performs. Depending on the actions present, the anti-virus software can determine if the program is malicious or not. If the anti-virus software finds malicious programming it will carry out appropriate disinfection actions.