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Free Software Magazine

All about antivirus software – What is the antivirus software and how it works?

A variety of strategies are often employed. detection based on trying to find patterns of known malicious executable code signing. However, a user may be infected with malware for which no new signature yet. To counter these threats called "zero-day heuristics can be used. One type of heuristic approach, signatures generic, we can detect new viruses or variants of existing viruses, malicious code known (or slight variations of this code) files. Some antivirus software may also provide that a file will do if you open / run to replicate in a sandbox, and analysis of what made to see if it performs malicious actions. If not, it could mean that the file is malicious.However, regardless of the usefulness of antivirus software, which can sometimes have drawbacks. Antivirus Software degrade the performance of the equipment has been designed effectively. Inexperienced users may have difficulty understanding the instructions and decisions of this antivirus software. A wrong decision could cause a security violation. If the Antivirus software uses heuristic detection (any type), the success depends on achieving the right balance between false positives and false negatives. False positives can be as destructive as false negatives. In one case, the defective virus signatures issued in error by deleting critical system files Symantec, leaving thousands of PC can not boot. Finally, the antivirus software usually works with the confidence of the operating system kernel level, creating a potential for more attack.In the drawbacks mentioned above, the effectiveness of antivirus software has also been studied and discussed. One study found that the success of the first virus detection software declined over a period of one year.

History:

There are competing claims for the innovator of the first antivirus product. Perhaps the first publicly documented in a computer virus removal nature is performed by Bernt Fix 1987.Before in Internet connectivity was widespread, viruses spread by infected floppy disks in general. Antivirus software came into use, but has been updated frequently. Meanwhile, virus checkers essentially had to check the files executable and boot sector of floppy disks and paper. However, the use of the Internet as it became common, first through the use of modems, the virus spreads through Internet.Powerful macros used in word processing applications like Microsoft Word, has a higher risk. Virus writers have begun to use macros to create viruses embedded in documents. This means that computers are now could be risk of infection hidden documents with macros attached as programs.Later mail messaging programs, including Microsoft Outlook and Outlook Express are vulnerable viruses included in the message body itself. Now, a user of the computer can be infected simply by opening or previewing a message. This means that antivirus scanners had to do many other file types. As always broadband connections became the standard virus and more were released, it became necessary to update anti-virus with increasing frequency. Even then, a new zero-day virus could be generalized before antivirus companies issued updates to protect against it.

Identify methods:

There are several methods for the antivirus software can be used to identify the detection method is based malware.Signature more frequent. To identify viruses and other malicious software, antivirus software compares the contents of a file to a dictionary of virus signatures. Because viruses can be integrated into existing files, the entire file is searched, not only as a set of parts, but. On the basis of detection heuristic detection of malicious activity, it can be used to identify unknown viruses.File emulation is another heuristic. File emulation provides for the execution of a program in a virtual and logging actions that the program performs. According registered shares, the antivirus software can not determine if the program is malicious or not and then take appropriate measures for disinfection.

Signature-based detection:

Traditionally, antivirus software largely based on the signature to identify malware. This can be very effective, but can not defend against malware and fewer samples were obtained and created the company. For this reason, approaches based on signatures are not effective against new and unknown viruses.
As new viruses are created every day, detection Signature of the focal length based on frequent updates of virus signatures dictionary. To help companies antivirus software, the software can allow users download new viruses or variants of the enterprise, enabling the virus signature is analyzed and added to the dictionary.
Although the approach based on signatures can effectively contain virus outbreaks, virus writers have tried to keep a step ahead of such software by writing "Oligomorphic", "polymorphic" and more recently, "Metamorphosis" viruses, which encrypt parts of themselves or modify as method of disguise, did not match virus signatures in the dictionary.

Heuristic:

Some antivirus software use sophisticated heuristics to identify malware new viruses or variants of known malware.Many infection begins as a single mutation or other improvements attackers can become dozens of slightly different strains, variants of the call. generic detection refers to the detection and elimination of multiple threats with a virus such definition.For only the Trojan Vundo has several family members, as classified by antivirus vendor. Symantec classifies Vundo family members of two different Member Trojan.Vundo.B.While Trojan.Vundo and may be advantageous identify a specific virus, may be quicker to detect a family of viruses through a generic signature or a match to a wrong existing signature. Virus researchers find common to all viruses in a single family and so you can create a single generic company. These companies include often non-contiguous code, the use of wildcards when the differences are. These savages allow the scanner to detect viruses, even so full of extra code and unnecessary. code padding is used to confuse the reader so as not threat.A detection can recognize using this method is called "heuristic".

Issues of interest:

Unexpected renewal

Some software Antivirus commercial end user license agreements a clause that the subscription will be renewed automatically and a credit card of the buyer is automatically charged at renewal without permission. For example, McAfee requires users to unsubscribe at least 60 days before the expiration of the subscription underway, while BitDefendersends unsubscribe notice 30 days prior to renewal. Norton Antivirus also renews subscriptions automatically default.Open source and applications Free software, such as Clam AV, provide the application of scanning and updates for free without subscription renewal.

Applications Rogue Security,

Some antivirus programs are actually malware disguised as antivirus software, such as WinFixer and MS Antivirus.

False-positive

A false positive is the identification of a file as a virus that is not a virus. If an antivirus program is configured to immediately delete or quarantine infected files (or the default), false positives in critical files can cause the operating system or antivirus software unusable.Certain some applications, such as AVG Free has a reputation for false positives.

system problems

Execution many antivirus programs at the same time can reduce performance and create conflicts.It is sometimes necessary to disable protection against viruses temporarily to install the critical updates such as Windows Service Packs or updating graphics card drivers. Protective antiviral activity may partially or totally prevent the installation of a major update.

-Effectiveness

Studies have shown that the effectiveness in December 2007 antivirus software has decreased in recent years, particularly against unknown or zero day attacks. The German magazine c't team found detection rates of these threats has decreased from 40 to 50% in 2006 to 20-30% in 2007. At that time, the only exception was the NOD32 antivirus, which achieved a rate Detection of 68 percent.The problem is amplified by the intent of virus writers changing. A few years ago, it was obvious when an infection virus was present. The virus of the day, written by amateurs, exhibited destructive behavior or pop-ups. Modern viruses are often written by professionals, financed by criminal groups organizations.Traditional antivirus run antivirus software on time, on demand and analyze some of execution in real time. If a virus or malware found the suspicious file is usually placed at the end of their chances aquarantine disrupt the system. Traditional solutions for virus scanning and compared to advertising and will be regularly updated dictionary of malware known as a blacklist. Some antivirus programs have additional options that use a heuristics engine that looks Furthermore, the file to see if it behaves in a manner similar to previous examples of malicious software. A new technology used by some antivirus whitelist this technology first checks if the file is about trust and not only.

Other methods

Antivirus software installed operating on a single computer is a means of protection against viruses. Other methods are also used, including antivirus cloud, firewalls and scanners.

Cloud Antivirus

In the antivirus program or a new document is scanned with a virus scanner one at a time. CloudAV be able to send programs or documents to a network cloud where you use multiple antivirus and behavioral detection simultaneously. Is it more complete and also the possibility to check the new document or the history of access programs. CloudAV is a cloud computing anti-virus program as a product of scientists at the University of Michigan. Each time a computer or device receives a new document or a program, this is automatically detected and sent to the Cloud Antivirus for analysis. CloudAV system uses 12 different detectors that act together to tell the computer where the product is safe to open.

-Network Firewall

network firewall and prevent unknown programs access the Internet to process protected system. However, they are not antivirus systems, as such, and therefore trying not identify or remove anything. You can protect against infection from outside the protected computer or LAN, and to limit the activity of any malware that is present by blocking incoming and outgoing requests are in some TCP / IP. A firewall is designed to respond to threats more comprehensive system of network connections in the system and not an alternative to a protection system against viruses.

Line-scan

Some manufacturers have websites with free online antivirus scanning capability of the entire team, only critical areas, records local folders or files.

For the best protection and 100% can use McAfee United Kingdom.

magazine design software? Help?

I have created a magazine for my education, media and other programs that are available at my school is Microsoft Word and do not want to use it, I use a high quality software to create a magazine totally believable and surprising. Is there a good software I can buy or get free construction a magazine? Thank you.

If you want professional quality software for the creation of a magazine, I recommend using Adobe InDesign. It handles graphics, text effects, packing, and more. It is the industry standard. You can go to adobe.com and buy it if you want. I know our local newspaper here uses the program for the design of the document, as it is very versatile. However, do not use either the full program. It more than something like a magazine.

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