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Zip Code Database Elevation

Computer Viruses

In 1983, Fred Cohen, the virus postulating The term "computer virus" invented "the program Was able to modify the 'infection or other programs that they This includes a copy of itself to the possibility of the development. "The term virus In fact, an important information resource is an acronym for them as well. Cohen After one year he and his 1984 expanded the definition of their paper, "Computer Virus "," the virus for computer systems or networks User's privileges to infect their programs using You can point out the global spread. In addition, the role of viruses able to And thus the infection grows. "Computer virus, We are now in 1986 with the creation of the brain derived - the first virus I know they get infected with any program that is a personal computer. Two brothers, it (Basid and Farooq Alvi of Lahore, Pakistan's small software Run House) wrote the virus and Anti-Virus is still going Between the start of the race program today.
Described above, using The virus is able to infect program files. But The virus also, this kind of data, particularly data Certain types of files can be infected, for example, running Files to support the content of the file, depending on the macro in Microsoft Office programs Created files.
, Also demonstrated multiple definitions exist difficulties Viruses generally do not support the content of executable files Similar capabilities are infected with the data files - for example, Adobe PDF files are widely shared and documents. JPG image file is used. However, in both cases, each run of the virus outside of Therefore, the dependency on the file, the virus has more A simple 'proof of concept than can be considered. In other cases, Infectable data file itself, but may not be a virus Allow for the introduction of the code. In particular, certain products Vulnerability in the same way as the data file to be manipulated Will host a program that can allow an unstable Period, after which malicious code can be introduced into the system Cause. This case is no longer simply a move away from their infection Less attention is given to the virus program files, Mr. Cohen is the case, first define the term. Thus, to simplify Modernization, it is safe for the virus to infect other files Specifically whether a program or data.
Some of the computer they share the characteristics of biological viruses The virus because the virus is known. Computer Viruses From computer to computer like a biological virus passes To pass from person to person.
There is more similarity Is at a deeper level as well. Biological virus Not a living thing. Virus protection of the DNA inside the jacket Pieces. Unlike cells, viruses, and there is no way anything or Correlated to reproduce itself - it is not alive. Instead, the cell biology of the virus must be injected its DNA. Viral DNA, and then the phone's existing machinery to reproduce themselves with Is used. In some cases, cells with a new virus particles Fills up to rupture with the release of a virus. In other cases, The new virus, and the bud of a particle in one cell Cells remained alive.
A computer virus shares some characteristics One. Computer viruses or other programs at the top of page Executed in order to get to piggyback. Once running, Then infect other programs or documents can be. Obviously, the analogy between computer and biological viruses to things, but There is a bit stretched enough similarities that the name attached.
A computer virus is a program for replication. To do so, It attaches itself to another program file (for example, Requirements, this. exe,. com,. the dll) to run and run whenever the host program. Beyond simple replication, the virus is almost always another goal to achieve Pursue: you can damage.
Damage routine, or payload Call, the destruction of the virus overwrites part of the important information Not kept on the hard disk's partition table Ranges Just sounds, pictures, or poison the damning effects of the user to To scramble the numbers in a spreadsheet.
It is worth bearing It's keeping in mind the following if you can run the virus does not give However, "damages the routine," even without, it continues to apply - Consumption of system memory, disk space, network slowdowns Traffic and generally poor performance. In addition, the virus code Bugs are often, but also to understand the paranormal share system You can be the source of the problem. Well, whether or not harmful viruses , On the presence systems are unstable and can lead Should not be tolerated.
Some viruses, logic bombs "and Together, "their presence is not known for a few months. Instead, the damage occurs immediately, but nothing of this virus Without replication - the trigger until the day or event they host preordained Damage to the system as a routine exercise or network Through.

The impact of viruses on computer systems
Virus The following year again, the program can do many kinds of Can.
Into the realm of other programs or disks themselves 1.Copy.
2.Replicate quickly and as often as possible, the infected system's disk Rendered useless and are filling up the memory system.
3.Display information on the screen.
4.Modify, damage or destruction of selected files.
5.Erase for the entire disc.
6.Lie a certain time or until certain conditions Met, will be activated after sleep.
7.Open network or the Internet Connect with other people's access to and control of the system even allows for Backdoor on infected systems.
8.Some outbreaks, the system There is a conflict, some programs (usually Windows) strange Action.
How the virus from one system Other radio?
Most of the entry of the virus that e-mail, Internet And is a floppy disk drive and modem, network connection Or other serial or parallel port connection. Today, more and more (internet, Intranet, drive, removable drive, shared, workplace Mutual's and e-mail), the virus is now spreading fast, which You can spread wider than ever.

The following few Common way for viruses on your computer You can enter the system:
• e-mail attachments
• Web page with malicious script or HTML e-mail
Internet (File Download) • The FTP traffic from
• Sharing Network File & general network traffic
• Demo software
• Pirated Software
• The contraction, cheap production program (Rare)
• Computer lab
• Electronic Bulletin Board (Board)
• diskette (using someone else's diskette with the data back and forth Transportation programs), the exchange

High-risk files

The most dangerous File types are:
. EXE files. com,. the XLS,. Doug. MDB,
They Can infect your computer does not need a special switch - All they do is run, and thus the spread of viruses. It is 99% of all viruses are written to the file format Has been estimated.
Possible virus carriers List:
EXE file - (executable file)
SYS - (executable file)
COM - (Run File)
Duck - (Microsoft Word and)
And XLS - (Microsoft Excel)
MDB, - (For Microsoft Access)
Postal code - (in the United States General) file compression
ARJ a - (in the United States General) file compression
DRV - (device driver)
BIN - (generic boot sector image file)
For SCR - (MS screen saver)

Common symptoms of virus infection

 computer The situation does not boot.
 computer's hard drive Space is reduced.
 application does not load.
 application takes to load more than normal Period.
 hard diving activities, especially anything on the computer Are being performed to increase.
Anti-Virus Software  message appears.
 number of hard drives Bad sectors will continue to increase.
Unusual graphics  Or a message appears on the screen
 file (Delete) to Missing
 message is not detected or recognized Hard drive appears.
 more on this computer The sound comes.
 some viruses take control of the keyboard and Sometimes the key to a nearby alternative to actually nureule. The virus "Lots" press it nothing appears on the screen Really.
Also interesting is the system time  effects. Clocks going back Can not wait for home workers is particularly terrible. More serious, however, This type of virus causing confusion about the program Click the number system is the time or date.
Some viruses  users to call out to his lovely Modem Costs can be. We do not know that one of the dial Premium phone number, but we shall no doubt Soon see one. Dial a particularly malicious virus 911 (emergency number in the United States) and the emergency services valuable time To fill.

Category of the virus
Of the virus Sources of information on the different types to be classified in the following ways: You can:

PDA viruses
Increasing the power of PDA's new Varieties were produced virus. Created by malicious programmers To cause mayhem and digital functionality of a PDA and other devices Run the program and took advantage of communication.
Blissfully Where is the joy of a safe world, users of these devices Can be synchronized with the hostage-virus downloads at the end of August 2000 Palm began with the discovery of the Statue of Liberty. After more Viruses have been found.
And yet their PC-based My cousin is not harmful, they still do not doubt that the user Threatening virus. They differ from the effects of the unwanted messages are harmless Or an increase in power consumption of all the programs installed on the blink Delete it. But the threat, and the destructiveness of these viruses Their attack is expected to parallel the development of devices is growing.

MULTIPARTITE Virus
Two or more different way of infection Multipartite viruses are called viruses combined. Virus Both of these types of files and disks to infect the boot sector Can. Multi-partite viruses share some boot sector Characteristics of viruses and virus files: they infect Can. com files. exe files on the hard drive of the computer Boot sector. Boot up the infected computer diskette, a typical Multi-partite viruses reside in memory and then their own for the first time To infect the boot sector of your hard drive is. There From a virus that can infect your PC's entire environment. This virus is not a class actually exists in many forms. However, they are a disproportionately large percentage of all infections account Does. Anticad tequila and is an example of a multipartite virus.

Bomb
2 types of bombs and logic bombs, time bombs are the most prevalent. A pipe bomb hidden on the disk of the victim and are waiting You can run before a certain date. Logic bomb date File or to a specific action taken by the user or program changes Can be activated by. Damage or disruption to their Because you can treat the system as a virus bomb.

Boot Sector Virus
Until the mid-1990s, the boot sector virus The most common type of virus, mainly in 16-bit DOS with a floppy Disc World has spread. Boot sector viruses, and floppy Disk and the user's hard disk boot sector to spread Infect the user's hard drive's master boot record (MBR) of the infections can be. Once the MBR or the boot hard drive Sector is infected, the virus into a computer and access All that can infect the boot sector of floppy disks to try. Boot sector viruses are examples of Michelangelo's Satria and Keydrop.
Boot sector viruses work like this: We have a user Have been infected diskette boot sectors and imagine. Thereof Copy user data, but I forgot to remove it A drive. The next time he is a diskette in the boot process Infected the boot sector program, the computer began to run. For the first time the virus infects the hard disk loading. Note that the boot order in CMOS (Let's C: drive to boot Can be prevented by changes before:). The first sector of the disk Hiding, the virus is loaded into memory, the system files Will be loaded before. This gives you complete control of DOS interrupts In the process, be able to understand the contents of the MBR, or their DOS boot sector to replace the original contents of the original boot sector data Click on the disk is moved to another area. The virus in memory Every time you start the computer is sometimes a hard disk upgrade Because the infected areas of the system. It is the lowest level of the first Are controlled by different parts of it are stored in the hard disk The original boot sector code, before running Disk System Services. The computer just seems to operate normally. Nobody added a second a few fountains are negative in a boot sequence Is added.
Happy virus will remain in memory During normal operation. It has control of the disk service Thanks to the fact that it is easy to monitor requests for disk access - Including a diskette. As soon as it is to access it on a diskette There to make sure that the diskette in the floppy drive Will make the request. After that it is already infected the boot to review Sector can be seen. It is its own code to boot from the diskette If you find clean alternative to the sector. From this moment diskette "Carriers" and the media will be justified, the other PC infections.

In addition, access to the boot sector virus on Request to monitor a particular disk. The boot sector, and Read the request itself can include code in the presence of the virus Tests for anti-virus programs can be. Virus To read the boot sector and does not allow it in the backup On the hard disk where to redirect all requests Is the original content. In this way, nothing unusual Will be detected. These methods of stealth technology and their major Goal is to mask the presence of the virus is. All Boot Viruses use stealth, but that which is common to do.
In addition, a non-booting (system) in the area of the hard and floppy disks File infector. One of these areas for the virus Spread on a computer also provides an efficient method. Boot Virus infection and spread of his goals of the program The virus has achieved a high level of success than.
Boot Viruses for DOS, Windows 3.x, Windows 95/98, you can infect Windows NT and Novell NetWare systems even. They enable the spread and Computer (rather than the operating system) to take advantage of the unique features of Is.
Being infected by boot sector virus Floppy disks are not in the system from the hard drive Boot the computer to find or correct the original boot sector Where it can be done by replacing the disk.

CLUSTER Virus
This type of virus, the disk will change File system. If you run a program from an infected disk, The program runs the virus as well as the cause. This The virus is a fantastic technology and all the programs on the disk Create infection.

E-mail viruses
This type of The virus can be transmitted via e-mail message Sent via a private network or the Internet. Some e The virus infected email attachment - the document to a file or message Is attached to the program will be sent. These types of viruses The victim is running when you open files attached to messages. E-mail Other types of the virus within the body of the message itself. Virus To save the message must be encoded in HTML format. A lot of fire to both the victim's e-mail viruses Address book attempts to propagate by sending a message that each of the virus Includes a copy.
In the latest incident a computer The world of viruses, e-mail virus, the surface of the March 1999 The Melissa virus is known. Melissa spread in Microsoft Word documents, e- Via e-mail transmission, and thus worked:
Anyone as a Word document Upload a virus to create an Internet newsgroup. Documents Download and someone opened it would trigger the virus. The following article is a virus (thus sending itself) e Mail message from a person's address book can be the first 50 people. E-mail message to the recipient opens the document in person Name, so that it contains, including any comments friendly I do not think the sun. The virus in the recipient's computer 50 new messages can be created. As a result, the Melissa virus It was rapidly spreading virus ever seen in a number of This large force at that time to shut down their e-mail system.
Appeared on 4 May 2000 ILOVEYOU virus, was also simple. It Attachment 2 contains the code snippet. People who Double-click the attachment I was able to run the code. This code is for everyone in the victim's address book, a copy of itself After sending the file on the victim's computer and began to damage. This is simply the number of virus obtained. Really Troy E-mail to distribute more than horses, it is a virus.
The Melissa virus took advantage of the built-in programming language Microsoft Word, or Visual Basic for Applications VBA reulhaetda of. It is a complete programming Language, and it is programmed to do things like modify files You can send an e-mail messages. This is useful, but also Auto-run feature is dangerous. Each time the document opens immediately Documents can be inserted into the programmer to run the program. This is how the Melissa virus is all interwoven. Open People infected with the Melissa virus, the document will be activated immediately. It sent 50 e-mail to the central file, Normal.dot 9 won all the files will be included in a later infecting virus is! It has created great confusion.
File infector
File infectors usually run in memory with the following extensions Infect executable files *. COM, *. EXE, *. DRV, *. DLL, *. Recycle bin, *. ovl, *. SYS. They Infected files by copying itself to other executable files, run Activated whenever the virus in memory will remain long after Activated Wed.
Thousands of different file infecting viruses exist, but Boot sector viruses, similar to the majority DOS and 16-bit environments Operated. Some, however, has successfully, And Apple Computer's Macintosh environment for Microsoft Windows, IBM's OS / 2, Infection.
File viruses to manipulate them into more sub-categories Their goal is to be divided into:

Hoengdancheol Virus Files
Less common types of viruses, cancel And stay resident file virus. This infection is usually the name of As you can file. com and. exe files. However, there are some devices Drivers virus, some viral infections overlay files And, but, with this extension more than 99% of the program is running. com and. exe-ins to do something about some of the virus hoengdancheol One does not spread. You are running an infected program. The virus usually runs after each program to see They're infected with it memory resident. Hoengdancheol file virus Dark forces are yeroneunyi Green Caterpillar.

Overwriting Viruses
The virus code, along with their part of their goal To cover, but by doing so they avoid infection File. Add this file to the virus or other purposes Other than radio does not play a role. Because of this, they Typically does not spread quickly and easily detected.

Parasitic Viruses
These viruses are largely on the executable file Without changing the contents of the host program to attach itself. They are in the beginning, end, or by adding your own code in the middle of Attachment of the switch and the flow of the program because the virus The first run. When the virus has finished the job, Control is passed to the host. The host is running one of A little delayed, but this is usually not visible.

Macro viruses
Many older applications that the user Application within the work order records associated with allowing a simple Their system has a macro to a specific keystrokes. Later, The user simply presses a key, when given the same task You can order.
More recent applications Provides a more complex macro system. Word users Directly executed within the processor or spreadsheet, word environment All files associated with processing and spreadsheet macros You can write a program. Unfortunately, this feature also It may be possible to create a macro virus.
A macro virus is currently about 80% of all viruses, the International Computer Security Association (ICSA), according to an account in the history of computers The virus is rapidly growing. Unlike other types of viruses Otherwise, the operating system and the spread of macro viruses, email attachments Files, floppy disks and are not easily specified, Web downloads, file transfer and collaboration applications.
Macro viruses, however, are application specific. A macro virus can infect a specific type of documents to Is designed as a Microsoft Word file or Excel files. They are Microsoft Word macro, utility, and Excel, Word Macro Excel documents can be infected with the virus by no means the same Against infections that accompany the application. Macro viruses Article 42 contained in a file on the application of the data files To travel and eventually infect hundreds of files You can, if undeterred corruption in the process of how the various documents Numerical data is deleted data corrupted.
Macro viruses Is written, "Everyone's programming language" - Visual Basic - and Are relatively easy to create. They are at different points For example, in the use of the file, when opened, closure or Infection can be stored in the deleted
Macro viruses Chronicles of a typical infection starts in the infected document Or spreadsheets will be loaded. In addition to the load application Accompanied by a file attached to a macro. At least one of the macro If you meet certain criteria, the application will also To run the macro once. Macro viruses automatically Run the application functionality of the system's macro control Can rely on to get to.
A macro virus is loaded And running, it's a new page for the user to edit and just waiting Back to the action, hurry up. It is a new document, and the virus After attaching a macro program to save the application Can be properly documents. In this way the virus Not spread to other files, and can completely separate fashion. Users have no idea of the infection. This new file in the future If the virus from another computer will open again Reloaded by the application running, and no doubt other Infection does not find the file.

Finally, as far as Macro viruses, are concerned about the application of the operating system Role. Some applications of a macro virus, which The program is installed and running the spread of the platform can be Can. For example, Microsoft Word can use a single macro Conceivably virus Windows 3.x, Windows 95/98, Windows NT, and Macintosh to Proliferation.

A macro virus for Word

In the summer of 1995, Microsoft Word 6 was the first product on the macro virus. WM is / Concept.A) really only the concept of evidence - installed a macro (called pages Of) statements contained in this on the first (:
"That's enough, my point To prove "
Most of the macro virus for Word called Function using 'automacros'. The basic principles of special names Some will run automatically with a macro when Word starts, Close to open the file. Normal.dot Landscape Macro viruses Insert the following macros - a standard which is loaded whenever Word starts Template.
There are several ways how to turn off Word automacros But this is not the ultimate solution. Some macro viruses Word for the environment by using another method to control.
Another way of self-protection may be read-only Normal.dot sets. But it also can be bypassed in addition, It is a user-defined template to prevent a user from Can.

Excel's macro virus

Excel to Word Provide opportunities for virus writers are the same. Automacros yiitneun directory in which it will automatically load XLSTART Was the template.
However, in Excel, VBA, just not normal The same macro in Word. In Excel, so called formula '- Spreadsheets Macros are stored in the sheet cells. The first macro virus Using a technique of XF / PAIX said.

Other macro viruses MS Office products:

Macro viruses for other Office products Writing is not difficult. Already, and transportation are a few viruses It is expected that in the near future that will power A macro virus can point to.

But The macro virus as a Word or Excel macro viruses, no danger of Does. Several other people have different limitations Office products, but the They do so because they are not in the data file Can often be shared.

Look at today's Power Point Can be viewed without the native macro virus is a risk that Recorded for the product. Programmers, the number of objects in the Excel or Word Their presentation may contain. And The object is a macro virus - they Presentations If you edit the presentation and the virus is more Can be spread with the parent application to open the infected object.

However, the situation dramatically the next few years Are subject to change. Many companies, Microsoft VBA, Has licensed technology, so for a different product The report macro viruses, even more can be expected.

Polymorphic virus
This kind of virus itself You can change it every time, it is difficult to separate Copied. The simplest viruses to infect your files Attach a copy of the same. Anti-virus program You can search for the virus' code (or signature) of Because it is always the same and quickly find the virus. These easy to avoid detection, polymorphic viruses, some Behave differently. A simple virus, unlike when the polymorphism Infection, the virus program, it is the body of the program Got the virus code. Scramble does not mean that the two Very similar infection, making detection more difficult. Such To create a new password for viruses every time they infect, so Routine, all the infected files to other sequences in the virus code must be.

Stealth Virus
Stealth actively trying to hide himself Seeking to detect or remove the virus attempts. They They also create other files in the user and the operating system Damage can be hidden to hide the changes.
Stealth Virus, or interrupt interception, in the end they are sometimes called, At the beginning of the memory blocks in the interrupt table Primary DOS-level control instructions. This virus, the ability to To provide)) again, interrupted by a call manager and the two systems Gain control, two important things: a need to avoid detection Hide for itself. They are really a disc technologies such as wiretapping Reads the copy provided with the infected (more stealthing Virus Instead of an uninfected copy of the original item), the disk directory An infected program file or folder (the size of the data for stealthing Changes), or both. For example, the size of a whale viruses stealthing Virus. It is infected. EXE files, program files and Infected files can be read by other programs attempt Alters the folder item. Whale virus adds 9216 infected Bytes in the file. Change the file size displayed on the virus May exist because of the virus, such as the following bytes Number (9216), File size directory / folder subtracted from a given Items did not change the size of the file on the user trust This is not a trick.
Anti-Stealth technology is not equipped with virus Vaccination program will be tricked.

Companion virus

Companion viruses, the virus file itself, the rules An exception is to be attached. Instead, the virus noinbunkke Create a new file, and depends on the behavior of DOS in the normal place of Running a program file to run. These viruses EXE files, the program is targeting. They are of the same name Create another file, but the virus code contains a COM extension. These viruses MS - DOS files) in the same directory (ABC.EXE and ABC.COM Yes : Share the same name, but the configuration file COM EXE file Run the file to allow the use of the property.
For example, a partnership CHKDSK.COM virus files and placed in the same directory, named by Chkdsk.exe Can be created. DOS is one of the 42 runs of the same name Whenever you need to select the two files. EXE file extension, and others. com extension of. com, run this file. This is the effective propagation How well has the great advantage of a - it's what Way to escape and does not edit the file to Protect the integrity test, or residence. Used by partners to the virus Another way is based on a defined path. Previously listed in the directory path to the virus-infected simply Put the file in the original program.

Program viruses
As a normal program and the program's virus Must be written for a particular operating system. Virus This is the most complete, but some of the Windows 3.x and DOS, Windows 95/98 Is written for, and even Unix. Compatible with all versions of Windows and DOS Some degree of success can host MS-DOS viruses. Programs typically viruses. com,. EXE files. sys extension. DLL,. ovl Or. SCR extension with the same infect program files. They are widely used in the program files because the virus Is an attractive target for makers have relatively Some viruses can attach a simple format.

Malicious programs and scripts

Those of viruses that Agents, such as downloading infected programs (on the Internet Software, for example, Java and ActiveX).

WORM

Bug ability To copy itself from machine to machine is a computer program. Worms normally move around and the computer network Infect other computers through. All LAN or corporate e-mail system Copy of the worm completely blocked, it can be rendered useless Can. Worms typically via the Internet through e-mail Message with an attachment to spread through the Internet Relay Channel chat.
For example, the Code Red worm itself over 250,000 times Replicated nine hours on 19 July 2001.
As part of the operating system software The worms typically use one kind of security holes. For example, Slammer worm (Bodily injury caused in January 2003) Microsoft SQL server, exploiting a hole.
Computer time and network worm Maximum bandwidth they use to replicate, they often evil intentions Is a kind of. The Code Red worm in 2001 was a big headline. Experts in the worm so effectively and completely stop the situation Expected to be able to interfere with the Internet.
Code Red The worm slowed down Internet traffic when replication itself But not nearly as bad as predicted start. Of worms For each copy of Microsoft Windows NT or Windows 2000 servers do not have a scan on the Internet Security patches installed. It is not secure Worms have a server on the server whenever you find yourself a copy. New The other server was infected with a copy of tests. Not secure Worms do not like this, depending on the number of servers to create hundreds of thousands of copies of Can.
Code Red worm was designed to do three :
• replicate itself each 20 days of the first Mon
"Chinese The page declares hacking • Changing from an infected server Web Page "
• Run a joint attack on the White House Web Server Attempts to overcome it
The most common version of Code Red Variations, in general, the mutant strain, the original code Ida Red's years on July 19, a copy of itself, is also known as 2001.

Trojan

Other types of malicious Trojans, Typically, depending on the user to do something different than expected, as The "something" defined as an agreement of evil. Most often, the Trojan These passwords - to do with theft or illegal Are associated with a remote access program that is used for Compromised machines allow denial of service attacks targeted. One of the services More basic forms of denial (DoS) attacks, too much data, Traffic, or commands that the target can no longer perform Key features of the system, including the flood. If you have multiple computers Gathered together to launch these attacks, it attacks the services, Is known as distributed denial of, or DDoS.
Trojans do not Because of his victims to the disk (or other disk Copy your own) on the overlap, they are technically not a virus Does. However, because they can do harm, a lot of Experts consider them a form of the virus. Trojan Often a hacker to create a backdoor on infected systems are used. Trojan, BackOrrifice is very dangerous, such as. Whoever To run the program if their computer connected to the hacker Internet, then you can control your computer - or transfer files to On a computer screen to capture information or run any program Kill running processes, etc.

Once the Trojan horse The program has the same rights as users of the computer system System is installed and the user did not intend to do something like Can be exploited:
 Deleting files
 Transfer to the attacker The user can read any file
 All files are changed The user can modify
 Other installed on the user's permission Program
 Run privilege escalation attack - over Trojans Raise the level of access you can try to exploit weaknesses Users run a Trojan horse. If successful, the increase in Trojans Privilege to work.
 Installation Virus
 Install other Trojans

Depending on the information of the virus Will help to minimize the risk of:

 users Really weak (as opposed to traditional e-mail you're afraid) Virus, they should be run more secure, such as Unix Operating system. Security (and unwanted human visitors) away from viruses Ability to protect one of these operations, because System, hard disk, the virus should not have to listen to.
 The Users are not secure if you use the operating system, virus Buy antivirus software that is a good precaution. Some Popular anti-virus programs will include:
• McAfee Virus Scan
• Norton Anti-Virus
• Virex
• PC for - cillin
• straight!
• AVG Anti-Virus System
 Automatic anti-virus software is always on the protection of Should be.
Manual (scans or automatic), their Check the hard disk occurs, you must schedule  users every week. They complement a self-protection, scanning and computer Make sure the virus is free.
Before first use  Check all the floppy disks.
 disable floppy disk booting - Most computer users can do this now, so that And it's a boot sector virus on a floppy disk Comes the risk of inadvertently left on the drive is removed.
The  their users to use antivirus software Their option to automatically update virus definition files Updated.
 Fabrication and structure of the disk must be maintained Users in a specific order to facilitate recovery from boot viruses 1 for.
 periodic backups of your hard disk must be complete.
 Users' to all the software they use I bought a legitimate copy of the write-protected backup check.
 E-mail message from an unknown person and e-mail You can not open the attachment. Word file attachments (. DOC) Spreadsheet (. Xls), the image (. GIF wah. JPG) and such data They damage the file to a location (Word and Excel macro viruses Pointed out problems that can come over to the document) refers. EXE file, such as With an extension of COM or VBS is an executable file, and the damage What kind of files you want to do is run. Moreover, That he should be OK, "the author" e-mail attachment Has been sent. From users of the latest viruses known to man Has shown that you can send an email message.
 ensure that potential users that a macro virus Enabled in all Microsoft applications, preventing them specifically If they do not know the function of the macro in the document macro Do not run.
 be the proper password, a shared network Is assigned to drive.

Some things are viruses!

Joke Program
Joke program, not a virus mitdoeji Inflict damage. The purpose of their own that are infected with the virus Damage to the system to scare their victims into thinking Will. For example, the message touched a joke program, users You can display a warning not to any key or any other person Your computer's hard disk will be formatted.

Droppers
By eyedropper Programs that are not infected with the virus but, it's a virus But it is when infected files on disk or in memory Run a virus is installed. Droppers sometimes been written as Convenient carrier for the virus and sometimes destructive Into action.

Fake
Look to the title round of virus I did not receive a chain letter with a warning from the very small number of e-mail People should be. They are often surprised people fake And had a good time means their cost. The reliability of its Usurps the air as a warning and the warning by passing Netizen Create unnecessary puroreeul Besides clogging mailboxes, e-mail Recipients are recommended.

Virus, virus detection methodology By anti-virus software has been applied:

3 main ways To detect the virus exist: Integrity checks (also known as checksumming Known), behavior monitoring, and pattern matching (scanning).

Integrity Check
Start by building a record of integrity, select the initial use Anti-virus program state (size, time, date, etc.) on your hard 2 files on the drive of all applications. The following program checksumming to use this data to see if the changes File Monitor. If you change the integrity of the state checker Has been warning users of possible virus.
However, How to have a few drawbacks that the biggest lie Alarms are all too common. Programs written using by checksumming Often, in the course of their normal operations, the integrity Activities appear to be a virus checker legitimate file changes Program will be rendered by the old. Integrity test Another weakness is that only after the virus has infected your system You can warn users to.

Operation Monitoring
Operation Monitoring programs typically terminated and (hoengdancheol) and Continuously monitors the interrupt request is passed to the table 're Living. Observation of the activities of these programs on the virus To engage them - is to request the boot sector, and in writing Or insert a memory-resident self-executable program for Write the opening. These programs monitor the behavior of the rules Is derived from user configuration settings.

Pattern Matching
"The anti-virus software, virus pattern Preview extensive database of known viruses at Sign, or to identify the telltale paint Process of "pattern matching using the phone viruses Code. The main areas of each scan, the virus signature files, thousands of For a list of antivirus software is on record to compare Can.
Match occurs, whenever anti-virus software User-configured action: take a clean, delete, quarantine, Pass (Denial of access for real-time scanning), or renaming.

Self-defense mechanism for the virus Evolved

Virus Of course, authors want their children to live successfully. Many anti-virus system for viruses, some of his For this reason, as a defense mechanism bokdoepnida.

Passive Defense:
Virus from an antivirus program on your own How to hide a variety of uses. More passive defenses, and polymorphism Analysis of the virus, such as programmatically difficult to use The virus was developed to find a constant string of virus code To counter the radio.
Today anti-virus system Analysis of polymorphic code and the virus is able to retrieve the identifier Is decrypted body. Encryption, so that the virus writers Anti-virus software, only to explain the complexity, Therefore, the misconception that the reaction to a clean program.

Aggressive self defense:
The virus actively their own Anti-virus software to protect your code, or damage By attempting to defend himself. Antivirus software is a simple way Locate the database you can modify or delete Them.
Using a more sophisticated stealth techniques to living virus. They asked to search using the infected files, they temporarily "" That, or he (the source of infection has not been reported), cleaning You can parameter. They have some programs Running, and if you have antivirus software Reaction can be monitored. The reaction of the list is endless. Usually refuse to run your antivirus program is running it But while it (often with fake error messages), or The action stops the virus can be cleared. There Sometimes, by modifying the code is very 'smart' virus is Partially disabled it is a popular program.
The trial and the vaccine-virus program is running 50000 Consider a multi-task as soon as a reply to a rare virus Can - for example, hard disk format.

Trap
Trap The most vicious form of self-defense and will operate as follows. The user's computer is infected, but everything is correct, but This appears to work. Once a user has a virus And remove the complexity found work - the program no longer correctly Or even if you do not have access to the hard disk boot execution Can be a clean system diskette.
The most well-known Traps The virus is One_Half. It is continuous), the hard disk (for all boot To encrypt data on two tracks. It partitions Sector is removed from the data file to several files Decoding will be able to access before. At this stage, The seriousness of the situation, but data recovery is still possible. However, users Disk Utility (running ScanDisk Etc.) and then the data will be lost forever, almost certainly damage Recovery.
The utility of the system relative to the file Is designed to repair minor damage and does not recognize There is no data encryption.

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