MICROSOFT 'S FREE VIRUS PROTECTION PROGRAM OVERVIEW
In 2008, the newspaper said that in last year's news was out:

"The world's number one software company Microsoft, PC protection from viruses in the 2009 program from the users will be free. Center in the state of Washington in the city of Redmond that Microsoft, code-named Morro from security software in 2009 from the second half of users to download free permit. Morro named this security software, Microsoft's sales in 2009 to June 30 of last will, that sold for $ 49.95 Windows Live OneCare security software to replace. Microsoft's offer of free security software, Symantec, McAfee virus program, such as independent producers' market will cause distress to live seems to .

This software is a good web site that she was my http://www.gokhanblog.com asked to address. According to the information we get out of this software.

Microsoft Security Essentials program name.
Programming Microsoft regarding consumer safety, general manager Amy Barzdukas "Consumers us with a real-time security protection software told me that they want. However, this type of software can not pay or do not want to pay as we know. Microsoft Security Essentials and consumers to obtain and easy to use, the user does not divide the work, very good quality can have a protection. " in the form of information to the site gave www.chip.com tr.

Microsoft Security Essentials program between languages that are supported by on October 22, 2009 that as of now does not Turkish.

Microsoft this security software that Microsoft Security Essentials'ýn (MSE) Facebook spread over a highly effective against harmful software such as Koobface was stated.

Detailed information about this program

http://www.chip.com.tr/konu/microsoft-security-essentials-final-surum_15527.html

You can read from. (22 October 2009)
This web site has been automatically translated. Please remember when you read this.
Computer virus
From Wikipedia, the free encyclopedia
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? For other uses of the head Virus (disambiguation), see.

Computer virus, or information within the user without the permission of the computer that changes the way we work and trying to hide himself in diðeramlarýn files that are actually a type of program.

The term usually malicious software (malware) dedilen used to express a wide area even though a real virus in the following two task conditions.

     * You must replicate all
     * Run the self (should run)

Topics
[hide]

     * 1 Comparison with biological viruses
     * 2 Classification
           o 2.1 File viruses
           Boot sector viruses that 2.2
           o 2.3 multi-part viruses
           o 2.4 Macro viruses
           o 2.5 Network viruses
           o 2.6 Companion viruses
           o 2.7 software bombs
           Cross-site scripting viruses that 2.8
           o 2.9 Sentinel
     * 3 other malicious software
           o 3.1 Trojan Horses
                 + 3.1.1 Service attack prevention Trojans
                 + 3.1.2 Proxy servers Trojans
                 + 3.1.3 FTP Trojans
                 Blocked Users + 3.1.4 Software Fixes
           o 3.2 Worms
           o Spyware 3.3
     * 4 The effects of computer viruses
     * 5 The use of the term virus
     * 6 History
     * 7 Why are computer viruses?
     * 8 Cogan strategies
           viruses that do not have built-in 8.1
           8.2 Resident viruses that
     * 9 protection detection methods
           o files and other unwanted Olta 9.1 host to avoid
           o 9.2 Kaçaklýk
           o 9.3 Deformation
                 + 9.3.1 Simple strain
                 + 9.3.2 with variable key encryption
                 Multi-pattern Code + 9.3.3
                 Metamorphosis + 9.3.4 code
     * 10 Open and Countermeasures
           it vulnerable to virus attacks and 10.1 of the operating system
           o 10.2 Software development role
           Antivirus software and other preventive measures that 10.3
           o 10.4 Toparlar methods
                 Virus cleaning + 10.4.1
                 Re-installation of the operating system + 10.4.2
     * 11 See also
     * 12 References

Comparison with biological viruses

How do viruses work? Computer viruses and biological viruses spread from person to person from one computer to another, such as can infect. For example, according to estimates of experts, called Mydoom worm in a single day in June 2004 on a quarter-million computers were infected. In other cases, in 2000 the ILOVEYOU virus, has created a similar effect. As of today in the world of computing and tens of thousands of viruses every day new ones are identified. Infection or spread of the virus because of the diversity to be valid for all how they work is difficult to summarize. However, usually used to indicate the various virus types most beautiful examples of broad categories bulunmaktadýr.ayrýca is a spam virus.

     For information on a floppy disk, the computer, just to copy DNA with the request that the cell nucleus, such as buzzing, humming is a paradise. Computers and floppy disks and tape drives that are connected to them, high-end copying accuracy be created. As with DNA molecules, magnetism bytes copied 'language can not'. Nevertheless, steps to duplicate itself can write a computer program that can. Replicate itself on a computer not only stay, will spread itself to other computers in a way. Computers bytes copied and bytes within these instructions blindly to obey are the better that makes itself two sitting ducks for the programs are as easy prey: software interference against the devastation of the gates until the end in a clear manner. Selfish gene theory and familiar to me any suspicious modern computer floppy disk and mail non-discrimination act will know the invitation to trouble. The only surprising aspect of today's epidemic of computer viruses, the emergence of the time taken is very sad.
     ...
     DNA viruses and computer for the same reason sanane spread: to do good in copying and copies will be spread around and will obey the instructions of viruses containing an environment where machines can be found. Relatively, respectively, these two environmental media and cellular physiology of a wide collection of computers and data processing machines provided by the environment. In other places, other media, other humming paradise Is Replication?

     Richard Dawkins, A Devil's Chaplain

Classification

Many types of viruses can be analyzed in sub-section. The main classification section are:
File viruses

File virus, parasites or viruses, also known as the executable and the executable files themselves (driver or compressed files) and the host program is run, effectively keeping the particles becomes code. Is activated later, the virus can spread itself by other programs that keep files and programs as provided to a malicious activities. Most of the files for viruses themselves to the system memory to install and can be spread on the drive to search for other programs. Found to contain the virus and the code of the program the next time the program tries to activate the virus also changes. Any system or program infected with the virus that has spread to all areas of the public who use the system again and again Until that do so. In addition to spreading this virus becomes active immediately, or through a trigger destructive component within a species are hosted on. Triggers a specific date, the virus will reach a certain number of copies can be anything or junk. Randex, Meve are a few examples can be given to viruses and MrKlunky file.
Boot sector viruses

To the hard disk boot sector and all information is stored through a program that provides the operating system is the place to start. Virus, each loaded into memory at startup in order to ensure puts the boot sector code. This, perhaps, today has been caused reduced in number. Programs on a computer with a floppy disk to another, moving from the periods when a boot virus was spreading fast. However, the CD-ROM With the start of the period, CD-ROM of information within and code can not be added to deðiþtilemez because this type of virus propagation stopped. Although the virus still exists in the boot of a relatively new age of malicious software are very rare. Another common reason is operating systems no longer protects the boot sector is receiving. Examples of boot viruses are Polyboot.B and AntiEXE.
Multi-part viruses

Boot sector viruses and file multi-part combination of virus. These viruses CD / DVD or floppy disk media and infected with viruses such as income and are placed in memory. Subsequently moved to the hard disk boot sector are. From the executable files on the hard disk sector (. Exe) infection and spread throughout the entire system. Nowadays viruses çokparçalý do not have much, but in the golden age, different transmission techniques combine to cause major problems capabilities were provided. The most famous multi-part Ywinz'dir virus.
Macro viruses

Macro viruses, macros, various programs or applications that contain viruses files are created. Microsoft Office programs created by the Word documents, Excel spreadsheets, PowerPoint presentations, Access databases, Corel Draw, etc. AmiPro application files created. among the affected file types. Macro viruses belonging to the application of the operating system is not spelled in the language they are independent and application platform that can run all operating systems (Windows, Mac, etc..) Can be spread between. Increasing capabilities of macro languages in applications and networks süreki likely to spread over such a large threat from the virus makes. The first macro virus written for Microsoft Word macro virus and found thousands edilmiþti.Bugun are determined in August 1995. Relax, Melissa.A and macro viruses Bablas terms örnekleridir.Çoðalma worm (worm) lara similar but they differ in terms of functions. how to make friends who'll be happy solerse it done ...
Network viruses

Network viruses, and even in the local network on the Internet about the sweep is very versatile. In general, shared resources, shared drives or folders are spread over. To a new system once infected, they search for potential targets on the network as they work to identify vulnerable systems. System, the system vulnerable to the virus when they infect the network and try to spread the entire network in a similar way. Nimda and was renowned network viruses are bad SQLSlammer.

metropolis Hacker (ayace) m.ayak

Companion viruses

Companion viruses [1], host files, but do not have MS-DOS on hold can be abused. Is a companion virus. EXE (application) files that use the name in general. COM rarely. Exd is creating new files with the extension. If the user of a particular program to run the command console, only the name of the program write. EXE extension, you forget to write DOS, the name and extension with the same extension of the files in the dictionary, which appears in front of the file to run the virus has been assumed will play. For example, user files adý.COM (virus file) and file adý.EXE (executive file) you have two files named on the command line and get just the file name is typed. Were examined as a result, the file extension virus file that will be carried out adý.com. Perform other duties assigned to spread viruses and is the same as my own after you have. Exe files will run. So that the user probably will not have the virus ayýrdýna. Under Windows 95 with some viruses and can run on Windows NT users are known in the DOS emulator. The current system files with viruses associated with the path of the same name creates files and directories within the path of the old with the new changes the virus. These viruses do not use MS-DOS command prompt to be available for use with Windows XP increasingly rare.
Software bombs

Software bombs, creating the necessary conditions are taken until the remaining code and special software are functioning. Maturing of the Terms to show user messages or files to delete will trigger certain functions, such as. Independent software programs in bomb shelters, such as viruses or worms can also can be part of. Affect the host after a certain number of bombs as an example can be given the software becomes active. Time bomb, software bombs and their sub-clusters in specific date or time have been programmed to be enabled. The famous Friday the 13th time bomb virus are examples.
Cross-site scripting viruses

A cross-site scripting virus (XSSV) cross-site scripting vulnerabilities to replicate the virus that are used. A web applications and web browsers XSSV who will spread the virus type is simbiyoz is needed. Actually xss not a virus, the system is open. Php-based sites with malicious code görülür.id = variable is used after the open is called. If the site is open to road link with the cookies can be played with open adminine. This is also so open hotmail mail from any address in terms of security should not be opened
Sentinel

Quite sophisticated and useful sentinel virus type infected computer remotely gives authorization to use. Sentinel boats, computers, called zombies or slaves created and block attacks such as the Service to be used in a malicious purpose in creating large networks are used.

Viruses, infect your machine or your machine is activated without the many ways is hiding. However, get active or not is very dangerous viruses and expeditious way to rein in the problem should be done.
Other malicious software

In the past, a computer hard disk is a computer that can carry harmful only method was to place. With the start of a new era of technology, now almost every computer is connected to the rest of the world. Therefore, locations and times of harmful contamination source exactly difficult to detect passing day. These are not enough in the age of computer, such as new types of malicious software are derived. Nowadays, the term virus, a computer will be exposed to attacks by malicious software, all the different methods used to specify a generic term has become. Described outside of the virus type found problems we face today are newish.
Trojans

Trojan horses that appear attractive but deceptive in fact malicious files. Existing files in the system, rather than add code to download screensavers, emails photos to show the impression they are dealing with a business such as wake. However, in the background, in fact, harmful activities, such as access to the files to delete. Trojan horses are computer hackers to access your personal and confidential information, allowing your secret doors are also created.

Trojans are not viruses because in fact, contrary to assumption fail to replicate themselves. The spread of a Trojan horse for the opening of the reserve is located, or e-mail attachment contains a Trojan horse of the file should be downloaded to a computer via the Internet and must be carried out.
Service attack blocking Trojans

Service blocking attacks (Denial of service attacks) is based on the basic idea of the Trojan horse on the victim's computer or Internet traffic to reach a web site to block file downloading to increase. Services Block Trojan horses, attack another version of mail-bombs are Trojan horses that the main objective as possible, to infect as many machines and certain e-mail addresses simultaneously, without filter münkün various objects and content is to attack with.
Proxy Trojans

This kind of Trojan horse to the victim's computer to the proxy server converts. This way, the victim computer at risk of internet service to be used for anonymous access to the whole world is open access. An attacker using the domain name registration for the victim computer can do, adult content sites with stolen credit cards to access and is illegal without a trace can take a lot of work.
FTP Trojans

This type of Trojan horses Trojan horses are the most simple and outdated. The only thing they do is used for FTP transfer 21 port to open and everyone can connect your computer to recognize opportunities. New versions of this type only allows the attacker to access your password-protected systems are in the structure. In fact the virus to become outdated Trojan'ýn money you still use yaygýndýr.Bu such viruses entering your system does not can steal the necessary information, credit card numbers and can make a lot of things similar. Today's technology has produced many programs will prevent this.
Blocked Users Detection Software

This Trojan horses to protect your machine, the work of popular antivirus and firewall software to block access to your system allows the attacker. One of the above-mentioned types of Trojan horse that will contain one or more structures may be in one.
Worms

Computer worms growing, independent and network connections that can work are programs that can move on. The main difference between viruses and worms are the multiplication and dissemination methods. To work with a virus to the host file or boot sector needs, while the spread between machines for the gene carriers need files. However, you can work independently on their own worms and network connections without the need for a carrier file can be spread over. Security threats caused by worms, a virüsünküne equals. Essential files on your system to destroy the worms, greatly slow down your machine and cause the collapse of some necessary programs such as the ability to create damage are all possible. MS-Blaster and Sasser worms, most worms are examples tanýnýþ.
Spyware

Spyware, ad-supported software, the other is a term used to qualify. Producing a shared software authors, in a program also earn money from selling advertising yayýnlatarak product can kulanýcýya. On the market, many large media companies to write their software, banner ads and banner ads in their attempt to suggest a certain percentage for each product sold through the commission promises to give. If the user in the software, you find annoying banner ads and licensing fees paid if the opportunity to get rid of tape accesses. This band produces advertising companies, in addition to the continuous use of your internet connection for your internet use statistical information to advertisers without your knowledge within the sending of some monitoring programs are installed on your system. Descriptive precision and software in the privacy policy of the data is not collected from your system and your identity will not be clear your personal computer, although specified by working as a server for your use at your own information and internet habits 3 is sent to the person or institution.

Spyware also slows down your computer, to use a portion of processing power, inappropriate at times annoying pop-up windows to bring up the Internet browser settings, such as change and anasayfanýzý celebrity are changing. In addition, this type of illegal software to create a big security threat, and viruses from your system to be cleaned up considerable power can be clearly shows the trouble.
Effects of computer viruses

Some viruses cause damage to applications, files, delete and re-format the hard disk in various ways, such as damage to computer have been with the program. Some harm, rather than to replicate only within the system and text, picture or video messages to be noticed by showing prefer. It seems harmless virus that can cause problems for Insert user. Occupied by the memory of the computer may slow down the machine, the system may be hesitant to act or even to crash. In addition, many viruses, the error (bug) is a source, and these errors can cause system crashes and data loss.
Use of the term virus

The term computer virus, is derived from the biological equivalent of the same logic kulanýlmaktadýr him. Although not exactly the correct term virus usually including Trojan horses and worms also expressed to all kinds of pests are used. Today, most well-known anti-virus software packages that can defend all kinds of attacks has a structure. Some technology community in terms of viruses, with the intention to underestimate the harmful to specify the printer is used.

Virus was first term in 1984, prepared by Fred Cohen Experiments with Computer Viruses used in his thesis, and the term is derived with Len Adleman indicated. But the 1972 David Gerrold'e When a science-fiction novel called HARLIE Was One, biological viruses, such as a computer program running VIRUS mentioned his dream. The term computer virus gene, Chris, and in 1982 his Claremont'in Uncanny X-Men graphic novel was published in the past. Therefore, Cohen's first time as virus definitions even though the academic term had been derived from very early on.
Date

First, in 1948 by John Von Neumann self-replicating computer program may have raised the idea.

A program called Elk Cloner was manufactured outside the lab or computer virus has been described as the first computer. In 1982, written by Rich Skrenta virus spread to the Apple DOS 3.3 operating system has been spread through floppy disks. This virus actually prepared by a high school student was a joke and a kind of game files were hidden inside. Game 50 viruses are released and subsequently a blank screen work in a poem about the virus named Elk Cloner spread by showing complete.

Computer Virus doctoral thesis in 1983 created the first theme.

The first PC (Personal Computer) virus (c) a boot sector virus called Brain, respectively, and Pakistan's Lahore city in 1986, working in the simple and was written by two brothers named Amjad Farooq Alvi. Brothers virus, formally, write their software to prevent pirated copies were prepared. But analysts Brain a kind of derivative (variant) of the Ashar virus, codes were examined were in fact created Brain'den claim ago.

Computer networks before becoming widespread, many virus removable media, particularly floppy disks, spread through. In the early days of the personal computer era many users with information or programs from one computer to another disk were already carrying. Some of the programs on this disk viruses spread by infected. Some of their computer by installing the boot sector is executed not executed intended to take were already enabled.

Traditional computer viruses in the 1980s as a result of the rapid spread of personal computers and modems to computer-based information systems as a result of the increase in the use of the software became common share. Computerized information systems (BBS) allows sharing of software, while contributing to the proliferation of Trojan horses, viruses commonly used software specially written to influence began. Gene shared software (Shareware) and illegal software on the BBS used for propagation of viruses were common carriers. On the one hand pirates, illegal copies of commercial software market, while the business community also has become the target of viruses on the current practices and games were already trying to secure.

The second half of the 1990s, macro viruses became common. Many of these types of viruses, such as Word and Excel in a scripting language that can affect many Microsoft programs get ready. Microsoft Office has been created with this virus infects documents and spreadsheets were. Word and Excel on Mac OS to run on Macintosh computers this virus spread. Many of these types of virus-infected virus were not in the ability to email. Viruses spread via e-mail showing the advantages of Microsoft Outlook Com arayüzününün were already using.

Macro viruses can be problematic for programs identified features. For example, some versions of Microsoft Word macros that were allowed to increase with additional blank lines. Some macro viruses behave in the same way normal macros Due to a new virus mistakenly identified as. In another example of the two macro virus infects documents at the same time, it is perceived as mated combination of the two, and probably a new virus as separate from their parents were identified. [2]
Preparing a computer virus can be sent via instant messaging. Infected by using the machine have a link to a web address to all persons in the list of people ready to send as a message. Person receiving the message from friends (or any other reliable source) come to believe that clicks the link, located on the site can be reached and the virus can be transmitted to the computer by using the above mentioned methods can be spread to other victims computer.

November 2001 using Outlook and Outlook Express security vulnerability "Badtrans" worm, a virus infected e-mail attachments for viruses must be opened with the thesis disproved.

New types of computer viruses are cross-site scripting virus. Revealed as a result of virus research in 2005 was serving as academic. Cross-site scripting vulnerability on the virus to spread to use. Since 2005 several cross-site scripting virus sample was observed. Among the major sites affected are located Myspace and Yahoo.
Why are computer viruses?

Unlike computer viruses on their own biological virus evolution. Computer viruses, nor what may have spontaneously from errors in the software (bug) may derived. Programmers or by people who use the software to virus are produced. Computer viruses are programs, but is able to perform activities.

Virus writers to produce and disseminate a harmful purpose can be attributed to many different reasons. Viruses for research projects, for a joke, to attack the products of certain companies for political purposes or to spread messages of identity theft, spyware and viruses hidden through methods such as racketeering and financial gain can be written for. Some viruses as printers was made on works of art and writing some kind of virus described as constructive hobby. In addition, many virus writer, the destructive effects of viruses on the system is not in favor of showing. Most printers, the operating system they are attacking a mental exercise or a pending çözülenmeyi seen as a logical question against the anti-virus software and played cat and mouse chase them attract the said. Some viruses are considered as well as viruses. Their programs in terms of security have to be developed infection or other viruses, they delete. Such viruses are very rare, and uses system resources, can damage infected systems, and sometimes other malicious code from being accidentally infected with the virus may become carriers.

Weak written form may become a good virus gene accidental damage. For example, a virus could identify the wrong target file may inadvertently delete a system file and innocent. In addition, normally works without the computer user's permission. Self-replicating code added continuously as they are acting in good faith to the problems caused by a virus, that does not replicate itself and a valid program that can handle the problem than the problem can be resolved to what extent raises suspicion. Virus writers to explain briefly the general realm of a qualified extraction is difficult. [3]

Many in the field of law to write any computer crime is considered as harmful.

     Computer viruses, such as disks and data lines is not limited to electronic media. Virus, the path to the other computer is a computer printed ink, the light rays to the human eye, the optic nerve and finger muscle contraction may continue. The codes of a virus program by pressing a computer that is presented to the attention of readers enthusiasts magazine was condemned by a large. In fact, any type of virus program about 'How' information published and the specific type of childish minds attention to the idea of viruses such withdrawal, the right is seen as irresponsible act.

     Richard Dawkins - A Devil's Chaplain

Multicast strategies

Of the virus to replicate itself by a virus able to be written to the execution and memory must be allowed. Hence many of the executable file virus program to keep their current. If a user program to start up if infected, the virus code is executed first. Their behavior according to the viruses out are classified into two types. Will hold non-resident viruses immediately seek other hosts, these goals can be transmitted to the control and eventually leave the program they infected. Built viruses begins playing when they do host lookup. Instead of execution with their loads into memory and control are left to the host program. This virus remains active in the background, the infected program file or the files of each program that accesses the operating system itself to cause infections.
Non-resident viruses

Non-resident viruses discovered consists of modules that can be considered a replicator module. Modules to be used for discovering the virus to infect new files is obliged to call. Explore the executable file modules facing each infected through replicator module is invoked.

For simple viruses the replicator tasks are:

     * 1 Open a new file
     * 2 Check the file has not been previously infected with a virus (if the bulaþtýrlýmýþ back to discover modules)
     * 3 Virus code into the executable file is kept.
     * 4 Save the starting point of the executable file.
     * 5 New additions to the starting point of the executable file virus code redirect to the launch area.
     * 6 Former starting field virus is executed the virus will spread to those areas will not be executed save.
     * 7 Save changes to the executable file.
     * 8 Save the file infected.
     * 9 Coupler module can find the virus files bulaþtýracaði back to discover modules.

Built viruses

Built-in non-resident viruses similar to the virus in the samples contain a multiplexer module. However, the built-in virus discovery modules that are called replicator module. Instead, the virus is loaded into memory module is executed Coupler time operating system and thus a task at a time while applying certain types of replicator modules are provided in the execution. For example, the operating system at a time when you play a file that can be called replicator module. In this case the virus being carried out in all eligible programs can be transmitted.

Built viruses, sometimes fast and slow-infectious sub-categories to be infectious can leave. Are fast catching much work to be infected file. For example, can be reached quickly infectious virus can infect every potential host file. This situation creates a particular problem for antivirus programs, because the virus scanner to scan the system in system-wide access to all potential host file will. If the virus scanner can not detect the existence of virus in the system memory, the virus, the virus scanner to scan the rear accessed by following all the files will be infected. Quick infectious, systems will rely on high-speed expansion. Mind that this method of transmission of the virus to other files, and in a sense, easier to identify himself. Because viruses invade the system memory and slow down gradually to the machine by performing suspicious actions by antiviruüs software edileleceklerdir difference. Slow-infectious while the host file are designed to be rarely infected. For example, certain slow-infectious only when they copy their files they hold. By limiting their activities being detected are slowly catching work to avoid. The computer can be the difference is not likely to slow down and fixes detect suspicious behavior to avoid triggering the anti-virus software will not put their best ardlarýna. Approach to the spread of infection and slow the entire system allowing such viruses did not achieve their goals.
Detection methods of protection

By users to be detected viruses on behalf complicate uses some deception. Especially in MS-DOS platform, some of the older viruses, infect a host file to change the content, despite the last modified date to remain unchanged in particular provide.

However, this approach can not deceive anti-virus software.

Some viruses, they are accessible without changing the files and file size without damaging the cause infections. This executable files by overwriting the unused areas perform. Such viruses are called cavity viruses. For example, a time of great devastation caused Chernobyl virus because this type of portable executable files affects the files are too many gaps. 1 KB in size, virus, infected files, the file size will not change.

Some antivirus programs as viruses, some anti-virus program before identified themselves as they try to avoid detection by the termination.

Computers and operating systems, development and preservation methods to update legacy karmaþýklaþtýkca or need to be replaced with new ones that are open.
Fishing and other unwanted files from the host avoidance

Continue to spread a virus but a host must hold on to. In some cases, the host program is not a good idea to mess with. For example, some antivirus programs to control the integrity of their code are examined. Therefore, these types of programs to keep the virus will cause the disclosure. Hence, some viruses, some anti-virus programs that are known parts of the program are designed not to hold on to. Another is the fear of the virus host species fishing (bait) files. Olta files, anti-virus or anti-virus programalarý by experts specially prepared for the virus to infect files. This is intended to detect the virus files in all of them for various purposes which are produced;

     * Antivirus experts to obtain virus samples bait files are used. To keep the virus in a small fishing and reviewing files, system files infected with the virus of major program review by experts is more practical use bait files.

     * Antivirus experts examine the behavior of the virus files and fishing methods used to assess their possible detection. This particular virus is very handy in situations where multiform. In this case, the virus was prepared to file a large number of fishing is intended to infect. All infected bait file, a virus scanner can not detect all virus evaluation versions are available.

     * Some anti-virus software is also regularly used files are accessed fishing. This is adaptation to fly anti-virus software user, the system could have warned the virus is active.

Olta files, viruses are detected or identified were first used makes it easier, such a virus infected files can not self-benefit. Virus, which contains commands that make sense, such as small program files, by staying away from suspicious looking program performs.

Another way to avoid viruses without the fishing line is also infected sparse. Brackets sometimes sparsely spread, in other circumstances, a candidate may be eligible to hold the host file will not hold. For example, a virus infected file on any host can decide not to be a random way or the host files on certain days of the week may prefer to spread.
Kaçaklýk

Some viruses, antivirus transferred to the operating system, stopping some of the requests are trying to fool antivirus software. A virus, anti-virus software to read the file is forwarded to the operating system requests from reaching the correct target, and even forward the request through its own antivirüsten can achieve hiding. Virus, then a clean version of the same file clean of the file, such as by offering anti-virus seemingly allows. Modern anti-virus software of this type of virus works to counteract concealment techniques. The only way to prevent system Kaçaklýk known to be clean from an environment önyüklemektir.
Strain

Many anti-virus software, ordinary program to check the virus signature files and scan for potential viruses are trying to find. Signature of a virus or virus family, indicating the specific type of virus is a special byte samples. If such a virus scanner examined the files in the sample is compared with a user is informed about the virus. In this case the user can delete the file or virus-free can. Some viruses, virus signatures and detection will be difficult or impossible to use techniques. These kinds of viruses during each dish a different version of the virus codes deðiþtirmektedir.Dolayýsýyla every host has to keep in house.
Simply change

In the past, viruses change themselves in ways simple. For example, viruses, and tasks contained in the source code exchange units were similar to subroutines. 2 +2 forum 1 +3 in the structure of a virus at the end of clearing any change in function was not revolves. Today, this situation does not create a problem for advanced virus scanner.
Encryption with variable key

More advanced method of the virus with a simple encryption method was to hide. In this case the virus, with a small decoder module consisted of a copy of the encrypted virus code. Each file is encrypted with a key different viruses in infected even if only part of the virus will always remain constant, the virus attached to the last part of the module will be solvent. In this case the virus scanner detected the virus using virus signatures will not be able, but hard to determine which part of the solver to find the virus there is the possibility of indirect ways.

In general, the application of the virus was simple techniques and a large majority solvents main virus file that is stored in each byte random key and has been making jewelry with Xor were obtained by merge. Encryption and decryption have the same order because of additional advantage to the virus were used uygulmalarýnýn Xor. (a XOR b = c, c XOR b = a.)
Multi-pattern Code

Multi-pattern codes, the browser for the first technical was a serious threat to supply. Encrypted viruses similarly encrypted files in multi-pattern viruses are transmitted with copies, respectively. However, the decoder module in each file ranged infected. Therefore, a well-written multi-pattern viruses in each infected did not have no item will remain constant and that the virus using signatures to detect viruses was impossible. Antivirus software virus, emulator (emulator) via an encrypted virus body, or by solving the statistical model could be found by doing analysis. To have multi-pattern code, viruses, encrypted within the body of multi-pattern engine (replacement engines or engine changes) should have.

Some viruses that increases the pace of change of the virus multi-pattern codes are using. For example, a virus in time can be programmed to show a slow change in shape or any other virus infected files hold copies may retain to himself. This kind of slow viruses multi-pattern rule, such viruses belonging to antivirus experts representing numulerini difficult to obtain. Because only a certain time in the process of similar or same type of bait file version of the virus will infect. This situation clearly demonstrates that the detection of such viruses in the virus scanners are not reliable and as a result of some samples of the virus is clearly able to escape being detected.
Metamorphosis code

Emulator Users (emulator) to avoid being detected by means of each new executable file is infected with the virus before their completely rewrites. They can spend a metamorphosis of this virus engines are required to metamorphosis. Engine is usually too large a metamorphosis and complex. For example, assembly language contains W32/Simile 14000th line and 90% belong to the meta-engine.
Open and Countermeasures
Of the operating system vulnerable to virus attacks

Computer viruses and biological viruses are known in many respects they are similar. The more genetic diversity within a community, the vibrant community of any disease that destroys the virus that are becoming extremely difficult. Likewise, the diversity of software systems over a network, viruses are destroyed limit.

Microsoft's desktop operating systems and office software packages provide advantages in the market has created a special interest in this case the 1990s. Users of Microsoft software (especially networking software such as Microsoft Outlook and Internet Explorer users) are defenseless against the propagation of viruses. Microsoft software, the company's desktop operating systems because of their superiority as the quantity is the target of many viruses and virus printers printer abuse by the many errors (bug) and they often keep their deficits within the review are received. Embedded (integrated) software that allows access to the file system includes a scripting language applications (eg VBScript and networking applications) is also vulnerable to attack.

Although the most popular operating system for Windows viruses printers although some viruses has been observed on other platforms. Third-party software runs on any operating system can theoretically run viruses. Some operating systems, others are relatively less safe. Unix-based operating systems (Windows NT-based platforms and downloads) by users of their own executable applications only allow to run in a restricted area.

As of 2006, one of the Unix-based operating system, Mac OS X to open the target areas of abuse (exploit) [4] is very low. Known security vulnerabilities of the worms and trojans to abuse the open categories included in the. Apple Mac OS Classic for older operating systems known as the number of viruses, according to sources of information to supply to changes. Apple only 4, while 63 independent sources to the operating system so the virus can infect is specified. Can be said for certain is that the Unix-based Mac Os operating system because of their vulnerability to abuse other operating system be relatively more difficult. Macintosh computers are few, because only part of Mac viruses, computer viruses can affect the printers that this situation is not very appealing. Viruses affected properties, often the basis of comparisons between Apple and Microsoft oluþturmaktdýr.

Windows and Unix have similar scripting abilities, but normal users are Unix operating system environment by preventing access to the passes in front of possible substitutions, Windows does that. In 1997, Bliss is known as Linux has emerged for the virus, antivirus companies, the leading Unix-like operating systems (Linux or Unix based) on Windows, such as viruses can come under bondage in predictions found. [5] Bliss, a typical Unix system for virustür. Bliss, activated by the user to run their own income and only the areas of user access rights (or programs) is infected. Unlike Windows users, most Unix user to install programs and software to make settings with the exception of such cases with the administrator account does not sign, so the user running the virus even if the operating system the virus can not infect files can not harm the system. Bliss virus never very common and more did this research as a means of curiosity remained. The source code, the creator of how it works by researchers were able to mail on behalf Usenet. [6]
Software development role

Software to prevent unauthorized use of system resources with security features designed, many virus systems or applications software errors (bug) the spread of abuse. Too many errors in the software (bug) created to stand in the software development strategy, but also the main source of many potential abuse will be.

Microsoft and proprietary software company of choice for producing closed-source software development process that by many is seen as the main source of security vulnerability. Open source software (GNU Association Software vb.) Allows users to examine the application code and to solve security problems, only one institution must be adhered to eliminate.

On the other hand, some open-source software development, virus writers can use reveals potential security problems, and therefore would increase the incidence of abuse is alleged. These people also very much like Microsoft's popular closed source software and software that are being abused because of a much wider area of influence due to the spread of abuse must be claimed against the natural.

A sample of the virus code (virus, certain death): del C: / WINDOWS / system / MOUSE.DRV del C: / WINDOWS / system / KEYBOARD.DRV del c: \ WINDOWS \ system32 \ drivers \ cdrom shutdown-s
Antivirus software and other preventive measures

Used to detect viruses that antivirus software has two methods. The first is to navigate and the most common, is to use virus signature definitions. Objection to this method, the user's list of virus signatures have been detected only viruses containing the signatures derived From the new threats due is to remain vulnerable. The second method by focusing on the general behavior of the virus detection is performed using the heuristic algorithm. Thanks to this method of anti-virus companies have already determined that they could not find viruses on your system.

Viruses belonging to many users downloading executable files to the computer to perform in case detection and antivirus programs that can clean the files from the system uses. Anti-virus software, computer memory (RAM and boot sectors), fixed or removable drives (hard disks and floppy disks) by reviewing files and virus signature database by comparing it with work. Some anti-virus software with the same procedure when opening files or even send and receive email while browsing can be done. This practice is called on access scanning. Anti-virus software, a host program to spread the virus zaafiyetlerini (open to) do not correct. I was taken a few steps to perform but to adopt this kind of anti-virus solutions can override the host software warranty. Therefore, users often belong to update the software vulnerabilities should be patched.

Person, in addition to important data and even the operating system will cause the virus by taking regular backups and can prevent possible damage. Backup hard not connected to the system, read-only access or disabilities (formatted with different file systems) is stored in environments that are very important. With this path, because if the virus data loss if compensatory damages using the latest backup is taken. Likewise, an employee disk (livecd) operating system, the actual operating system become unavailable to open the computer can be used. Another method belonging to the different operating systems to store backups on different file systems. A virus is unlikely to affect all file systems. Therefore, the data in the file system backup to different types of transfer is appropriate. For example, Linux can write to NTFS partitions using special software has to, Therefore this type of person does not install the software and backup of the NTFS partition will be transferred in order to create the MS Windows installation performs the backup of Linux viruses will be preserved. Similarly, MS Windows file system Ext3 can not read and therefore to be obtained by installing Linux Ext3 section away from the threat of replacement will make a backup of the transfer.
Methods roundup

A computer virus is below the harmful effects, re-install the operating system from continuing to use the computer will not be safe. However, a computer virus can be caught when the preferred option has many rally. Appropriate application, depending on the seriousness of the virus type is selected.
Virus cleaning

1. method: Windows Xp on a probability, important records and system files have been pre-recorded back to a checkpoint system restore will kulanmaktýr tool.

2. methods: AntiVirus and AntiSpyware with Antivirus silmektir.Bedava as Avast, Free Avg AntiSpyware Download Download AntiSpyware AntiSpyware'dirAvast Avg Incentives
Re-installation of the operating system

Serious cases of extreme operating system may be necessary to reinstall. To do this, delete all the disk and virus infection did not need to perform a clean environment through the installation.

     GNU Free Documentation License This text and the license has been (an official Turkish translation of this license real-mecuttur). "Computer Virus" is quoted from his Wikipedia article.

     Computer viruses themselves to legitimate programs and patches that are pieces of program code that disrupts their normal functioning. In exchange the disk, internet, local networks can move. Themselves with a program, usually through networks and 'worms' called programs are technically different. A different kind, 'Trojan horses', is the third member of the destructive program. But the people themselves do not copy them because of pornographic or otherwise appealing content are based on the principle of copy. Virus and worm programs in computer language, both in fact 'Two Enable me at are programs. Both types of assets make you feel insignificant and perhaps the author will satisfy their sense of self-conceit can do other things. Side effects 'ridiculous' may (Macintosh computer speakers, even the 'do not panic Do' testimony can call and predictably the opposite effect, such as viruses); may be malicious (will take place shortly after the disaster snicker a laugh with the display after notice of the hard disk, the viruses have etc.), may be political (Spanish Telecom and Beijing viruses, respectively, and the phone charges from being massacred protesting students shall only); may be clumsy or simply (effective programmers write a virus or worm, the low-level systems required to handle calls about is incompetent). November 2, 1988 the United States the vast majority of computing power stroke, the most famous Internet Worm (very) bad faith was not written but are out of control and within 24 hours, approximately 6000 computer memory occupied by growing at a pace began to copy itself.