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Computer Virus
In 1983, Fred Cohen coined the term computer virus, postulating a virus was "a program that can 'infect' other programs by modifying them to include a possibly evolved copy of itself. The term virus is actually an acronym for Vital Information Resources Under Seize. Mr. Cohen expanded his definition a year later in his 1984 periodical, A Computer Virus, noting that a virus can spread throughout a computer system or network using the authorizations of every user using it to infect their programs. Every program that gets infected may also act as a virus and thus the infection grows. Computer viruses, as we know them now, originated in 1986 with the institution of Brain - the first virus for private computers. Two brothers wrote it (Basid and Farooq Alvi who ran a small software house in Lahore, Pakistan) and started the race between viruses and anti-virus programs which still goes on today.
Using the above explanation, it can be said that viruses infect program files. However, viruses can also infect certain types of data files, specifically those types of data files that support executable content, for instance, files created in Microsoft Office programs that rely on macros.
Compounding the elucidation difficulty, viruses also exist that demonstrate a similar ability to infect data files that don't typically patronize executable content - for instance, Adobe PDF files, widely used for document sharing, and .JPG image files. However, in both cases, the relative virus has a dependency on an appearance executable and thus nor virus can be considered more than a simple proof of conception. In other cases, the data files themselves may not be infectable, but can allow for the presentation of viral code. Specifically, vulnerabilities in certain products can allow data files to be wielded in such a way that it will cause the host program to become erratic, after which malicious code can be introduced to the system. These examples are given simply to note that viruses no longer relegate themselves to simply infecting program files, as was the circumstance when Mr. Cohen first defined the term. Thus, to simplify and modernize, it can be safely stated that a virus infects other files, if program or data.
Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person.
There are similarities at a deeper level, as well. A biological virus is not a living thing. A virus is a shred of DNA inside a protective jacket. Unlike a compartment, a virus has no way to do anything or to procreate by itself -- it is not living. Instead, a biological virus must inject its DNA into a compartment. The viral DNA then uses the cell's existing mechanism to clone itself. In some cases, the cell fills with new viral motes until it explosions, releasing the virus. In other cases, the new virus particles sprout off the cell one at the peak of, and the cell remains alive.
A computer virus shares some of these peculiarities. A computer virus must piggyback on top of some other program or document in mandate to get executed. Once it is running, it is then competent to infect other programs or documents. Obviously, the similarity between computer and biological viruses stretches things a morsel, but there are enough counterparts that the name sticks.
A computer virus is a program that replicates. To do so, it needs to affix itself to other program files (for instance, .exe, .com, .dll) and execute whenever the host program executes. Beyond simple replication, a virus nearly forever seeks to achieve another purpose: to cause mar.
Called the damage routine, or payload, the devastating part of a virus can scope from overwriting critical information kept on the hard disk's partition table to scrambling the numbers in the spreadsheets to just taunting the user with sounds, pictures, or unpleasant effects.
Its value bearing in idea, however, that even without a damage routine, if viruses are allowed to run unabated then it will proceed to propagate--consuming system memory, disk space, slowing network traffic and generally degrading representation. Besides, virus code is often buggy and can also be the source of weird system problems that take weeks to understand. So, whether a virus is harmful or not, its presence on the system can guide to instability and should not be stomached.
Some viruses, in conjunction with "logic bombs," do not make their presence known for months. Instead of causing damage in a little while, these viruses do nothing but replicate--until the preordained trigger daytime or accident when they unleash their damage routines on the host system or across a network.
Impact of Viruses on Computer Systems
Virus can be reprogrammed to do many kinds of harm including the following.
1.Copy themselves to other programs or areas of a disk.
2.Replicate as rapidly and frequently as possible, filling up the infected systems disk and memory rendering the systems useless.
3.Display information on the screen.
4.Modify, corrupt or destroy elected files.
5.Erase the contents of entire disks.
6.Lie quiescent for a specified time or until a given condition is met, and then become active.
7.Open a back door to the infected system that allows someone another to access and even control of the system through a network or internet connection.
8.Some viruses can crash the system by causing some programs (typically Windows) to behave oddly.
How viruses spread from one system to another?
The most possible virus entry points are email, Internet and network connections, floppy disk drives, and modems or other serial or parallel wharf connections. In today's increasingly interconnected workplace (Internet, intranet, shared drives, removable drives, and email), virus outbreaks now can spread faster and wider than ever before.
The following are some common ways for a virus to enter the users computer system:
•Email attachments
Malicious scripts in network pages or HTML email
•FTP traffic from the Internet (file downloads)
Shared network files & network vehicle in general
•Demonstration software
•Pirated software
Shrink-wrapped, product programs (rare)
•Computer labs
Electronic bulletin boards (BBS)
Diskette bartering (using other peoples diskettes for carrying data and programs back and along)
High risk files
The most dangerous files types are:
.EXE, .COM, .XLS, .DOC, .MDB
Because they don't need any special transition to infect a computer -- all they've got to do is run and consequently the virus spreads. It has been estimated that 99% of all viruses are written for these file formats.
A account of possible virus carriers includes:
EXE - (Executable file)
SYS - (Executable file)
COM - (Executable file)
DOC - (Microsoft Word)
XLS - (Microsoft Excel)
MDB - (Microsoft Access)
ZIP - (Compressed file, common in the USA)
ARJ - (Compressed file, common in the USA)
DRV - (Device driver)
BIN - (Common boot sector picture file)
SCR - (Microsoft screen saver)
Common Symptoms Of Virus Infection
?Computer does not boot.
?Computer hard drive space is reduced.
?Applications will not load.
?An application takes longer to load than normal time time.
?Hard swoop play mushrooms primarily when nought is creature done on the computer.
?An anti virus software message appears.
?The number of hard drive wrong sectors steadily increases.
?Unusual graphics or messages appear on the screen
?Files are lacking (canceled)
?A message appears that hard drive cannot be detected or recognized.
?Strange sounds comesintoseffect the computer.
?Some viruses take control of the keyboard and sometimes substitute a adjoining key for the one actually pressed. Another virus "swallows" key presses so that nothing appears on the screen.
?Also interesting are system time effects. Clocks going backwards are especially horrifying for workers who cannot wait to go home. More seriously though, this type of virus can cause confusion for programs which depend on the system time or date.
?Some viruses can cost the user dearly by dialing out on his modem. We do not know of one which dials bonus tel numbers but no doubt we shall see one soon. One especially malicious virus dials 911 (the emergency number in the USA) and takes up the invaluable time of the emergency services.
Categories of viruses
Depending on the source of message different types of viruses may be categorized in the following ways:
PDA VIRUSES
The increasing power of PDAs has spawned a new propagate of viruses. Maliciously creative programmers have leveraged the PDA's ability to communicate with other devices and run programs, to cause digital mayhem.
The blissfully secure world where users of these devices could synchronize and download with impunity came to an bring an end to ... August 2000 with the finding of the virus Palm Liberty. Since then, many more viruses have been discovered.
Though as yet as disadvantageous as their PC-based cousins, these viruses still posture a menace to unsuspecting users. Their effects vary from the harmless flashing of an unwanted message or an increase in power expense, to the deletion of all installed programs. But the threat is growing, and the destructiveness of these viruses is expected to parallel the evolution of the devices they attack.
MULTIPARTITE VIRUSES
A virus that combines two or more different infection methods is called a multipartite virus. This type of virus can infect both files and boot sector of a disk. Multi-partite viruses share some of the specifics of boot sector viruses and file viruses: They can infect .com files,mens asics gel nimbus, .exe files, and the boot sector of the computers hard drive. On a computer booted up with an infected diskette, the typical multi-partite virus will first make itself resident in memory then infect the boot sector of the hard drive. From there, the virus may infect a PC's entire environment. Not many forms of this virus class actually exist. However, they do list for a disproportionately large ratio of all infections. Tequila and Anticad are the examples of multipartite viruses.
BOMBS
The two most prevalent types of bombs are time bombs and logic bombs. A time bombard hides on the victims disk and waits until a characteristic date before running. A logic bomb may be activated by a date, a change to a file, or a particular action taken by a user or a program. Bombs are treated as viruses because they can cause damage or disruption to a system.
BOOT SECTOR VIRUSES
Until the mid-1990s, boot sector viruses were the most universal virus type, spreading especially in the 16-bit DOS globe via floppy disk. Boot sector viruses infect the boot sector on a floppy disk and spread to a user's hard disk, and can also infect the main boot disc (MBR) on a user's hard drive. Once the MBR or boot sector on the hard drive is infected, the virus attempts to infect the boot sector of every floppy disk that is inserted into the computer and accessed. Examples of boot sector viruses are Michelangelo, Satria and Keydrop.
Boot sector viruses work like this: Let us assume that the user received a diskette with an infected boot sector. The user copied data from it but forgot to remove it from drive A:. When he started the computer next period the boot process will execute the infected boot sector program from the diskette. The virus will load first and infect the hard disk. Note that this can be prevented by changing the boot series in CMOS (Let C: drive boot before A:). By hiding on the first sector of a disk, the virus is loaded into memories before the system files are loaded. This allows it to acquisition complete control of DOS interrupts and in the process replaces the incipient contents of the MBR or DOS boot sector with their own contents and move the native boot sector data to another place on the disk. Because the virus has infected a system area of the hard disk it will be loaded into memory each time the computer is started. It will first take control of the lowest level disk system services before executing the native boot sector code which it has cached in another portion of the hard disk. The computer seems to conduct accurate as it should. Nobody will notification the surplus few fragments of a second joined to the boot sequence.
During normal action the virus will happily stay in memory. Thanks to the truth that it has control of the disk services it can accessible monitor requests for disk access - including diskettes. As presently for it gets a apply for access to a diskette it will decide namely there is a diskette in the floppy steer. It will then analyze its boot sector to see whether it has yet been infected. If it finds the diskette wash it will replace the boot sector with its own code. From this moment the diskette will be a "carrier" and become a middle for infections on other PC's.
The virus will also monitor special disk requests for access to the boot sector. The boot sector contains its own code, and a request to read it could be from an anti-virus program checking for virus presence. The virus will not allow the boot sector to be read and will redirect all requests to the place on the hard disk where it has backed up the original contents. In this way nothing uncommon is detected. Such methods are called stealth techniques and their cardinal goal is to mask the presence of the virus. Not all boot viruses use stealth but those which do are common.
Boot viruses also infect the non-file (system) areas of hard and floppy disks. These areas offer an efficient way for a virus to spread from one computer to another. Boot viruses have attained a higher degree of success than program viruses in infecting their targets and spreading.
Boot virus can infect DOS, Windows 3.x, Windows 95/98, Windows NT, and even Novell Netware systems. This is because they exploit inherent features of the computer (rather than the operating system) to spread and activate.
Cleaning up a boot sector virus can be acted by booting the machine from an uninfected floppy system disk rather than from the hard drive, or by discovery the original boot sector and replacing it in the correct place on the disk.
CLUSTER VIRUSES
This type of virus makes changes to a disks file system. If any program is run from the infected disk, the program causes the virus to run as well. This technique creates the phantom that the virus has infected every program on the disk.
E-MAIL VIRUSES
These types of viruses can be transmitted via e-mail messages sent along personal networks or the internet. Some e-mail viruses are transmitted as an infected attachment- a document file or program that is additional to the message. This type of virus is run when the victim opens the file that is attached to the message. Other types of email viruses reside within the body of the message itself. To store a virus, the message must be encoded in html format. Once launched many e-mail viruses attempt to spread by sending messages to everybody in the victims address book; each of those contains a copy of the virus.
The latest thing in the world of computer viruses is the e-mail virus called Melissa virus which surfaced in March 1999. Melissa spread in Microsoft Word documents sent via e-mail, and it worked like this:
Someone created the virus as a Word document uploaded to an Internet newsgroup. Anyone who downloaded the document and opened it would trigger the virus. The virus would then send the document (and accordingly itself) in an e-mail message to the first 50 people in the person's address writing. The e-mail message contained a friendly memorandum that included the person's name, so the recipient would open the document musing it was harmless. The virus would then create 50 new messages from the recipient's machine. As a result, the Melissa virus was the fastest-spreading virus ever seen and it compelled a number of massive companies to shut down their e-mail systems at that time.
The ILOVEYOU virus, which appeared on May 4, 2000, was even simpler. It contained a piece of code as an attachment. People who double clicked on the attachment allowed the code to execute. The code sent copies of itself to everyone in the victim's address book and then started corrupting files on the victim's machine. This is as simple as a virus can get. It is actually more of a Trojan nag distributed by e-mail than it is a virus.
The Melissa virus took advantage of the programming language built into Microsoft Word called VBA, or Visual Basic for Applications. It is a complete programming language and it can be programmed to do things like adjust files and send e-mail messages. It also has a profitable but dangerous auto-execute feature. A programmer can insert a program into a document that runs directly whenever the document is opened. This is how the Melissa virus was programmed. Anyone who opened a document infected with Melissa would immediately refresh the virus. It would send the 50 e-mails, and then infect a central file called NORMAL.DOT so that any file saved later would also involve the virus! It created a colossal muddle.
FILE INFECTING VIRUSES
File infectors operate in memory and usually infect executable files with the following extensions: *.COM, *.EXE, *.DRV, *.DLL, *.BIN, *.OVL, *.SYS. They activate every time the infected file is executed by copying themselves into other executable files and can remain in memory long after the virus has activated.
Thousands of different file infecting viruses exist, but similar to boot sector viruses, the vast majority operates in a DOS 16-bit environment. Some, however, have successfully infected the Microsoft Windows, IBM OS/2, and Apple Computer Macintosh environments.
File viruses can be separated further into sub-categories by the way they manipulate their targets:
TSR FILE VIRUSES
A fewer common type of virus is the terminate-and-stay-resident file virus. As the name suggests these infect files usually these are .com and .exe files. there are however some appliance driver viruses, some viruses that infect overlay files, and notwithstanding over 99% of executable programs have the extension .com and .exe, some do not .For a TSR virus to spread some one has to run an infected program. The virus goes memory resident typically looking at each program run afterward and infects it. Examples of TSR file viruses are Dark Avenger and Green Caterpillar.
OVERWRITING VIRUSES
These viruses infect by overwriting part of their target with their own code but, by doing so, they damage the file. The file will never serve another purpose other than spreading the virus further. Because of this they are usually detected rapidly and do not spread easily.
PARASITIC VIRUSES
These viruses attach themselves to executables without substantially changing the contents of the host program. They attach by addition their code to the opening, end, or even medium of the file and divert program stream so that the virus is executed first. When the virus has achieved its job, control is passed on to the host. Execution of the host is a mini delayed but this is usually not noticeable.
MACRO VIRUSES
Many older applications had simple macro systems that allowed the user to record a sequence of operations within the application and companion them with a specific keystroke. Later, the user could perform the same sequence of operations by only hitting the specified key.
Newer applications provide many more complex macro systems. User can write entire macro-programs that run within the word processor or spreadsheet environment and are attached directly onto word processing and spreadsheet files. Unfortunately, this ability also makes it possible to create macro viruses.
Macro viruses currently account for about 80 percentage of all viruses, according to the International Computer Security Association (ICSA), and are the fastest growing viruses in computer history. Unlike other virus types, macro viruses arent specific to an operating system and spread with ease via email attachments, floppy disks, Web downloads, file transfers, and cooperative applications.
Macro viruses are, however, application-specific. A macro virus is designed to infect a specific type of document file, such as Microsoft word or excel files. They infect macro utilities that accompany such applications as Microsoft Word and Excel, which means a Word macro virus cannot infect an Excel document and vice versa. A macro virus is embedded in a document file and can voyage between data files in the application and can finally infect hundreds of files if undeterred and in the process do manifold levels of damage to data from corrupting documents to deleting data.
Macro viruses are written in "every man's programming language" -- Visual Basic -- and are relatively simple to create. They can infect at assorted points during a file's use, for example, when it is opened, saved, closed, or deleted
A typical chronology for macro virus infection begins when an infected document or spreadsheet is loaded. The application also loads any companioning macros that are attached to the file. If one or more of the macros encounter certain criteria,Choo shoes, the application will also immediately execute these macros. Macro viruses rely upon this auto-execution skill to gain control of the applications macro system.
Once the macro virus has been loaded and executed, it waits as the consumer apt amend a current file, and then kicks into deed anew. It attaches its virus macro programs onto the new document, and then allows the petition to retention the document usually. In this vogue, the virus spreads to different document and does so in a completely discrete fashion. Users have no motif of the infection. If this new document is later opened aboard dissimilar calculator, the virus ambition once repeatedly load, be fired by the application, and find other unsuspecting files to infect.
Finally, as distant as a macro virus is concerned, the application serves as the operating system. A single macro virus can spread to any of the platforms on which the application is installed and running. For example, a unattached macro virus that uses Microsoft Word could conceivably spread to Windows 3.x, Windows 95/98, Window NT, and the Macintosh.
Macro viruses for Word
In the summer of 1995, Microsoft Word 6 was the first product affected with macro virus. The first one (WM/Concept.A) was really only a proof of concept - one of the installed macros (called Payload) contained only this remark:
That's enough to prove my point
Most macro viruses for Word use a feature phoned 'automacros'. The basic principle is that some macros with special names are automatically executed when Word starts, opens a file, or closes a file. The macro virus then inserts macros into NORMAL.DOT - a criterion template which is loaded every time Word starts.
In Word there are some ways to maim automacros but this isn't the ultimate solution. Some macro viruses use other methods to take control over the Word context.
Another method of self-protection may be to set NORMAL.DOT to read only. But this can also be bypassed and, in adding, it prevents the user from customizing the template.
Macro viruses for Excel
Excel has the same opportunities for virus authors as Word. It has automacros and a directory called XLSTART from which templates are automatically loaded.
But Excel does not have equitable normal VBA macros like Word. In Excel there are so called 'formulas' - macros stored in spreadsheet cells. The first macro virus using this technology was XF/Paix.
Macro viruses for other MS Office products:
Writing a macro virus for other Office products is not difficult. There have been already some viruses for Access, and it is expected that there will be macro viruses for Power Point by and by.
But those macro viruses are not as dangerous as the macro viruses for Word or Excel. Not because of some constraint of these other Office products, but because data files from these products are not so frequently shared.
There is one danger which can be seen in today's Power Point even without original macro viruses written for this product. Programmers can contain in their presentation any number of objects from Excel or Word. And these objects can be infected with macro viruses - if they edit the presentation and open the infected thing with its parent application, then the virus can scatter further.
But the present location may alteration dramatically over the next few years. Microsoft has licensed VBA technology to many firms, so an tin expect to penetrate more macro viruses for other products, too.
POLYMORPHIC VIRUSES
This type of virus can change itself each time it is copied, making it difficult to seclude. Most simple viruses attach alike copies of themselves to the files they infect. An anti-virus program can detect the viruss code (or signature) because it is always the same and quickly ferret out the virus. To avert such easy detection, polymorphic viruses operate somewhat differently. Unlike the simple virus, when a polymorphic virus infects a program, it scrambles its virus code in the program body. This scrambling means that no two infections look the same,tory burch on sale, making detection more difficult. These viruses create a new decryption routine each time they infect, so every infected file will have a different sequence of virus code.
STEALTH VIRUSES
Stealth viruses actively quest to hide themselves from offers to detect alternatively remove them. They likewise can conceal changes they make to other files, hiding the damage from the user and the operating system.
Stealth viruses, or Interrupt Interceptors, as they are periodically called, take control of opener DOS-level directions by intercepting the intervene chart, which is located at the starting of memory. This gives the virus the ability to do two major things: 1) gain control of the system by re-directing the interrupt calls, and 2) hide itself to discourage revelation. They use techniques such as intercepting disk reads to invest an uninfected copy of the original item in place of the infected copy (read-stealthing viruses), varying disk directory or folder data for infected program files (size-stealthing), or either. For example, the Whale virus is a size-stealthing virus. It infects .EXE program files and alters the folder entries of infected files when other programs attempt to read them. The Whale virus adds 9216 bytes to an infected file. Because changes in file size are an indication that a virus might be present, the virus then subtracts the same number of bytes (9216) from the file size given in the directory/folder portal to cheat the user into believing that the files size has not changed.
An antivirus program which is not equipped with anti-stealth technology will be tricked.
COMPANION VIRUSES
A companion virus is the exception to the rule that a virus must attach itself to a file. The companion virus instead creates a new file and relies on a behavior of DOS to execute it instead of the program file that is normally executed. These viruses target EXE programs. They create another file of the same name but with a COM extension containing the virus code. These viruses take advantage of a attribute of MS-DOS which allows files to share the same first name in the same directory (e.g. ABC.EXE and ABC.COM) but executes COM files in favorite to EXE files.
For example, the associate virus might create a file named CHKDSK.COM and location it in the same directory as CHKDSK.EXE. Whenever DOS must prefer between executing 2 files of the same label where one has an .EXE extension and the other a .COM extension, it executes the .COM file. This is not an effective access of spreading but has one big avail - it does not rectify files in any way and so can escape integrity tests or resident protection. Another method which can be used by companion viruses is based on defined path. A virus simply puts an infected file into the path listed before the directory among the original program.
PROGRAM VIRUSES
Like normal programs, program viruses must be jotted for a specific operating system. The vast majority of viruses are jotted for DOS but some have been written for Windows 3.x, Windows 95/98, and even UNIX. All versions of Windows are compatible with DOS and can host DOS viruses with varying degrees of success. Program viruses infect program files, which commonly have extensions such as .COM, .EXE, .SYS, .DLL, .OVL, or .SCR. Program files are charming targets for virus writers because they are widely used and have relatively simple formats to which viruses can attach.
Malicious Programs and Scripts
Viruses that infect surrogate programs (such as those that download software from the Internet; for example, JAVA and ActiveX).
WORM
A worm is a computer program that has the aptitude to duplicate itself from machine to machine. Worms normally push approximately and infect other machines via computer networks. An entire LAN or corporate e-mail system can become altogether clogged with copies of a worm, rendering it useless. Worms are usually spread over the internet via e-mail information attachments and through internet relay conversation aisles.
For example, the Code Red worm replicated itself over 250,000 times in around nine hours on July 19, 2001.
A worm normally exploits some sort of security aperture in a piece of software or the operating system. For sample, the Slammer worm (which caused havoc in January 2003) exploited a hole in Microsoft's SQL server.
Worms use up computer time and network bandwidth when they are replicating, and they often have some sort of malign intent. A worm called Code Red made huge headlines in 2001. Experts portended that this worm could clog the Internet so effectively that things would completely grind to a cease.
The Code Red worm slowed down Internet traffic when it began to replicate itself, but nowhere near as badly as predicted. Each copy of the worm scanned the Internet for Windows NT or Windows 2000 servers that do not have the Microsoft security patch installed. Each time it found an unsecured server, the worm copied itself to that server. The new copy then scanned for other servers to infect. Depending on the number of unsecured servers, a worm could conceivably create hundreds of thousands of copies.
The Code Red worm was designed to do three things:
•Replicate itself for the first 20 days of each month
Replace Web pages on infected servers with a page that declares "Hacked by Chinese"
Launch a premeditated bombard on the White House Web server in an attempt to overwhelm it
The most common version of Code Red is a variation, typically referred to as a mutated strain, of the original Ida Code Red that replicated itself on July 19, 2001.
TROJAN HORSES
Trojans, another form of malware, are generally agreed upon as doing something other than the user expected, with that something defined as malicious. Most often, Trojans are associated with remote access programs that perform unlawful operations such as password-stealing or which grant compromised machines to be used for targeted gainsay of service attacks. One of the more basic forms of a gainsay of service (DoS) attack involves flooding a target system with so much data,ecco schoenen, traffic, or commands that it can no longer perform its kernel functions. When multiple machines are gathered together to launch such an attack, it is known as a dispensed denial of service attack, or DDoS.
Because Trojan horses do not make duplicates of themselves on the victims disk (or copy themselves to other disks), they are not technically viruses. But for they can do harm, many experts consider them to be a type of virus. Trojan horses are often used as by hackers to create a back gate to an infected system. Trojans, such as BackOrrifice are quite risky. If anyone runs this program and his computer is connected to the internet, then the hacker can take control of that computer - migrate files to or from the computer, capture screen contents, run any program or kill any running process, etc.
Once a Trojan is installed onto the system this program has the same prerogatives as the user of the computer and can exploit the system to do something the user did not intend such as:
?Delete files
?Transmit to the intruder anyone files that the user can read
?Change any files that the user can modify
?Install other programs with the user’s privileges
?Execute privilege-elevation attacksthe Trojan can attempt to exploit a weakness to raise the level of access further the user running the Trojan. If successful, the Trojan can manipulate with increased privileges.
?Install viruses
?Install other Trojans
The Following Tips Will Help The User To Minimize Virus Risk:
?If the users are really worried about orthodox (as opposed to e-mail) viruses, they should be running a more safe operating system like UNIX. One should not listen about viruses on these operating systems because the security features keep viruses (and unwanted human visitors) away from the hard disk.
?If the users are using one unsecured operating system, then purchasing virus protection software is a pleasing shield. Some fashionable anti virus programs include:
•McAfee Virus Scan
•Norton Anti Virus
•Virex
•PC—cillin
•Avast!
•AVG Anti Virus System
?Automatic protection of anti-virus software should be cornered on at a time.
?The users should perform a handbook scan (or schedule a scan to occur automatically) of their hard disks weekly. These scans appendix automatic protection and validation that the computer is virus-free.
?Scan all floppy disks before 1st use.
?Disable floppy disk booting -- most computers now allow the user to do this, and that will eradicate the hazard of a boot sector virus coming in from a floppy disk accidentally left in the drive.
?The users should Enable Automatic Update adoption of their anti-virus software in order to update their virus definition files.
?Creation and livelihood of a rescue disk should be done by the user in order to facilitate recovery from certain boot viruses.
?Periodic backups of the hard disk should be done.
?Users should buy valid copies of all software they use and make write-protected backups.
? Email messages and email additions from unknown folk should not be opened. Attachments that come in as Word files (.DOC), spreadsheets (.XLS), images (.GIF and .JPG), etc., are data files and they can do no damage (noting the macro virus problem in Word and Excel documents said upon). A file with an extension like EXE, COM or VBS is an executable, and an executable can do any sort of damage it wants. Further it should be verified that the "inventor" of the email has sent the attachments. Newer viruses can mail email messages that appear to be from a human user understand.
?The latent users should determine that Macro Virus Protection is qualified in all Microsoft applications, and they should never run macros in a document unless they know specifically the functionality of the macros.
?Appropriate Passwords should be assigned to the shared network drives.
Things that are not viruses!
Joke programs
Joke programs are not viruses and do not inflict any damage. Their purpose is to frighten their victims into cerebral that a virus has infected and damaged their system. For example, a joke program may display a message warning the user not to touch any keys or else the computers hard disk will be formatted.
Droppers
A dropper is a program that is not a virus, nor is it infected with a virus but when run it installs a virus into memory on to the disk, or onto a file. Droppers have been written sometimes as a handy carrier for a virus and sometimes as an deed of sabotage.
Hoaxes
There must be very few people on email who haven't received a shackle letter with the subject line advising of a virus doing the rounds. These are often hoaxes and meant to frighten people and have amusement at their consumption. The warnings encourage the receiver of the e-mail to pass the omen to the netizens and accordingly create an needless furor, except clogging mailboxes, as it usurps an air of credibility.
Methodology of virus detection applied by antivirus softwares:
Three main methods exist for detecting viruses: integrity checking (also known as checksumming), behavior monitoring and pattern matching (scanning).
Integrity checking
Antivirus programs that use integrity checking start by building an initial record of the status (size, time, appointment, etc.) of every application file on the hard drive. Using this data, checksumming programs then monitor the files to see if changes have been made. If the status changes, the integrity checker warns the user of a possible virus.
However, this usage has several drawbacks, the biggest being that artificial panics are totally too common. The records secondhand by checksumming programs are often rendered obsolete by legitimate programs,Jimmy Choo shoes, which, in their normal lesson of operations, make changes to files that emerge to the Integrity checker to be viral activity. Another weakness of honesty retarding is that it can only alert the user after a virus has infected the system.
Behavior monitoring
Behavior Monitoring programs are usually terminate and stay resident (TSR) and constantly monitor requests that are passed to the interrupt table. These programs are on the lookout for activities that a virus might engage in--requests to write to a boot sector, opening an executable program for writing, or placing itself resident in memory. The behavior these programs monitor is derived from a user-configurable set of rules.
Pattern matching
Using a process called "pattern matching," the anti-virus software draws upon an nationwide database of virus patterns to nail known virus signatures, or telltale snippets of virus code. Key areas of each scanned file are likened against the list of thousands of virus signatures that the anti-virus software has on record.
Whenever a mate occurs, the anti-virus software takes the action the user has configured: Clean, Delete, Quarantine, Pass (Deny Access for Real-time Scan), or Rename.
Self Defense Mechanisms Evolved By Viruses
Virus authors of course wish that their child successfully lives. For this reason there are many viruses outfitted with some self-defense mechanisms opposition anti virus systems.
Passive Defense :
Viruses use a kind of methods to hide themselves from antivirus programs. Passive defense uses programming methods which make analysis of the virus more difficult, e.g. polymorphic viruses which were developed to counter scanners seeing for constant strings of virus code.
Today antivirus systems are experienced of analyzing polymorphic code and questing for virus identifiers in the decrypted body. The virus authors responded by making the encryption too complicated for antivirus software to unravel, thus mistaking it for a clean program.
Active Self-defense :
Viruses actively defend themselves by protecting their own code or by attempting to damage antivirus software. A simple method is to locate antivirus software databases and amend or delete them.
More sophisticated resident viruses use stealth techniques. When they detect a request to use an infected file, they can temporarily "clean" it or report its original (uninfected) parameters. They can monitor which programs are being executed and react if it is antivirus software. The list of such reactions is endless. Usually, the execution of the antivirus program is refused, but it could be wiped (often accompanied by a bogus mistake message) or the virus suspends its activities while it runs. There are occasionally extremely 'clever' viruses which modify the code of a specific AV program to partially disable it.
There are very rare viruses which consider an attempt to run an anti-virus program as proud and immediately reply with some retaliate action - case in point hard disk formatting.
Trap
A trap is the most malicious fashion of self-defense and works It’s about time. Although the users computer is infected but anything appears to go correctly. Once the user discovers the virus and removes it entities obtain perplexing - programs no longer run properly or the hard disk may become inaccessible even when booting from a clean system diskette.
The best known trap virus is One_Half. It continuously encrypts the data on a hard disk (two tracks on every boot). If it is removed from the section sector before data files are decoded then some files will become inaccessible. At this stage the situation is solemn but recovery of the data is still possible. However, if the user runs a disk utility (Scandisk etc.) to repair the damage then the data will almost naturally be lost forever.
These utilities are devised to mend relatively minor damage to file system and do not recognize the encrypted data.
REFERENCE:
1. Mary Landesman “What is a virus?”
http://antivirus.about.com/cs/tutorials/a/whatisavirus.htm
2. NetGuide “What are computer viruses? “–
http://www.netguide.co.nz/knowhow/tutorials/print.php?iid=38
3. Marshall Brain “How Computer Viruses Work”
http://www.Howstuffworks How Computer Viruses Work.htm
4. AVG Anti Virus Free Edition Help
Developed by Grisoft Inc
5. Norton Anti-virus Help
Developed by Symantec Corporation
6. Trend Micro PC-cillin Help
Developed by Trend Micro Inc
7. Peter Norton “Computer Viruses”
Introduction to Computers, Tata McGraw Hill Co:
8. Dr.Solomon ”About Viruses” &”Virus Prevention”
Dr.Solomon’s Virus Encyclopedia, Dr.Solomon’s Software Ltd.
9. C.A.Schmidt ”Virus”
The Complete Computer Upgrade And Repair Text Book,Dreamtech
10. S.Jaiswal “Virus Detection And Elimination”
Information Technology Today, Galgotia Publication Pvt. Ltd.

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