Which are the various computer virus threats and there type
PC Virus
A PC infection is a pernicious program that self-reproduces by duplicating itself to another program. As it were, the PC infection spreads independent from anyone else into other executable code or records. The reason for making a PC infection is to taint defenseless frameworks, gain administrator control and take client delicate information. Programmers structure PC infections with malevolent plan and go after online clients by deceiving them.
One of the perfect techniques by which infections spread is through messages – opening the connection in the email, visiting a tainted site, tapping on an executable document, or survey a contaminated ad can make the infection spread to your framework. Other than that, diseases likewise spread while interfacing with effectively contaminated removable stockpiling gadgets, for example, USB drives.
It is very simple and straightforward for the infections to sneak into a PC by avoiding the guard frameworks. An effective break can cause difficult issues for the client, for example, contaminating different assets or framework programming, altering or erasing key capacities or applications and duplicate/erase or scramble information.
How does a PC infection work?
A PC infection works in two different ways. The principal kind, when it arrives on another PC, starts to recreate. The subsequent sort plays dead until the trigger kick begins the malevolent code. As it were, the contaminated program needs to rushed to be executed. In this way, it is exceptionally noteworthy to remain protected by introducing a powerful antivirus program.
Generally, the complex PC infection accompanies avoidance capacities that help in bypassing antivirus programming and other propelled levels of resistances. The main role can include taking passwords or information, logging keystrokes, undermining documents, and in any event, assuming responsibility for the machine.
Along these lines, the polymorphic malware improvement as of late empowers the infections to change its code as it spreads progressively. This has made the infection discovery and distinguishing proof exceptionally testing.
The History of Computer Virus
Robert Thomas, a designer at BBN Technologies built up the principal known PC infection in the year 1971. The primary infection was initiated as the "Creeper" infection, and the trial program did by Thomas tainted centralized computers on ARPANET. The print message showed on the screens read, "I'm the creeper: Catch me on the off chance that you can."
Be that as it may, the first wild PC infection, most likely the first to be found throughout the entire existence of PC infections was "Elk Cloner." The Elk Cloner contaminated Apple II working frameworks through floppy plates. The message showed on tainted Apple Computers was an amusing one. The infection was created by Richard Skrenta, a young person in the year 1982. Despite the fact that the PC infections were structured as a trick, it likewise edified how a noxious program could be introduced in a PC's memory and prevent clients from expelling the program.
It was Fred Cohen, who authored the expression "PC infection" and it was following a year in 1983. The term appeared when he endeavored to compose a scholastic paper titled "PC Viruses – Theory and Experiments" specifying about the pernicious projects in his work.
Versions of Computer Viruses
A PC infection is one sort of malware that embeds its infection code to increase itself by modifying the projects and applications. The PC gets contaminated through the replication of malevolent code.
PC infections come in various structures to taint the framework in various manners. The absolute most normal infections are
Boot Sector Virus – This sort of infection contaminates the ace boot record and it is testing and an unpredictable assignment to evacuate this infection and regularly requires the framework to be arranged. Generally it spreads through removable media.
Direct Action Virus – This is likewise called non-inhabitant infection, it gets introduced or remains covered up in the PC memory. It remains appended to the particular kind of records that it contaminate. It doesn't influence the client experience and framework's exhibition.
Inhabitant Virus – Unlike direct activity infections, occupant infections get introduced on the PC. It is hard to recognize the infection and it is even hard to expel an inhabitant infection.
Multipartite Virus – This sort of infection spreads through different ways. It taints both the boot area and executable records simultaneously.
Polymorphic Virus – These sort of infections are hard to relate to a conventional enemy of infection program. This is on the grounds that the polymorphic infections changes its mark design at whatever point it recreates.
Overwrite Virus – This sort of infection erases every one of the documents that it taints. The main conceivable system to expel is to erase the contaminated records and the end-client needs to lose every one of the substance in it. Recognizing the overwrite infection is troublesome as it spreads through messages.
Spacefiller Virus – This is additionally called "Pit Viruses". This is called so as they top off the vacant spaces between the code and subsequently doesn't make any harm the record.
#File infectors:
Barely any record infector infections come joined with program documents, for example, .com or .exe records. Some document infector infections taint any program for which execution is mentioned, including .sys, .ovl, .prg, and .mnu records. Subsequently, when the specific program is stacked, the infection is likewise stacked.
Other than these, the other record infector infections come as a totally included program or content sent in email connections.
#Macro infections:
As the name proposes, the large scale infections especially target full scale language directions in applications like Microsoft Word. The equivalent is inferred on different projects as well.
In MS Word, the macros are keystrokes that are inserted in the archives or spared arrangements for directions. The large scale infections are intended to add their pernicious code to the certified full scale successions in a Word record. Be that as it may, as the years passed by, Microsoft Word saw handicapping of macros of course in later forms. Consequently, the cybercriminals began to utilize social building plans to target clients. All the while, they stunt the client and empower macros to dispatch the infection.
Since large scale infections are making a return the ongoing years, Microsoft immediately fought back by including another component in Office 2016. The element empowers security directors to specifically empower full scale use. In actuality, it very well may be empowered for confided in work processes and blocked whenever required over the association.
#Overwrite Viruses:
The infection configuration reason will in general shift and Overwrite Viruses are transcendently intended to pulverize a record or application's information. As the name says everything, the infection in the wake of assaulting the PC starts overwriting records with its own code. Not to be trifled with, these infections are increasingly fit for focusing on explicit documents or applications or efficiently overwrite all records on a contaminated gadget.
On the flip side, the overwrite infection is fit for introducing another code in the documents or applications which projects them to spread the infection to extra records, applications, and frameworks.
#Polymorphic Viruses:
Increasingly more cyber criminals are relying upon the polymorphic infection. It is a malware type which can change or transform its fundamental code without changing its essential capacities or highlights. This helps the infection on a PC or system to dodge identification from numerous anti malware and danger location items.
Since infection expulsion projects rely upon distinguishing marks of malware, these infections are painstakingly intended to escape discovery and ID. At the point when a security programming distinguishes a polymorphic infection, the infection changes itself in this way, it is never again discernible utilizing the past mark.
#Resident Viruses:
The Resident infection inserts itself in the memory of a PC. Fundamentally, the first infection program isn't required to taint new records or applications. In any event, when the first infection is erased, the adaptation put away in memory can be actuated. This happens when the PC OS stacks certain applications or capacities. The inhabitant infections are inconvenient because of the explanation they can run unnoticed by antivirus and antimalware programming by covering up in the framework's RAM.
#Rootkit Viruses:
The rootkit infection is a malware type which subtly introduces an illicit rootkit on a contaminated framework. This opens the entryway for aggressors and gives them full control of the framework. The aggressor will have the option to on a very basic level alter or handicap capacities and projects. Like other advanced infections, the rootkit infection is likewise made to sidestep antivirus programming. The most recent forms of major antivirus and antimalware projects incorporate rootkit examining.
#System or Boot-record Infectors:
The Boot-record Infectors taint executable code found in explicit framework zones on a circle. As the name suggests, they connect to the USB thumb drives and DOS boot segment on diskettes or the Master Boot Record on hard circles. Boot infections are not any more typical nowadays as the most recent gadgets depend less on physical stockpiling media.
Step by step instructions to Avoid Email Viruses And Worms
Here are some basic guidelines you can pursue to abstain from being tainted by infections through email.
Step by step instructions to Be Safe From Email Viruses And Worms
Here are some basic guidelines you can pursue to abstain from being contaminated by infections through email.
Do's
1. Utilize an expert, email administration, for example, Runbox. Membership administrations give more significant levels of security and backing.
2. Ensure that your Runbox infection channel is enacted.
3. Utilize the Webmail interface at www.runbox.com to peruse your email, or don't download all your email to an email customer concealed. Screen your email first, and erase suspicious-looking and undesirable messages before downloading the real email to your neighborhood email customer.
4. Ensure your PC has refreshed enemy of infection programming running locally. Programmed updates are basic for successful infection insurance. Joined with server-side filtering, you presently have two layers of security.
5. Incapacitate message see in your email customer, particularly on Windows stages. Something else, noxious projects joined to approaching messages may execute consequently and taint your PC.
6. Disregard or erase messages with connections seeming, by all accounts, to be sent from official Runbox email addresses. Runbox once in a while sends email to our clients, beside answers to request and installment updates. We for all intents and purposes never send an email with connections to clients.
7. Take alert when opening illustrations and media connections, as infections can be veiled accordingly records.
8. Keep up a few autonomous email accounts. In the event that an infection contaminates your solitary business email address, you'll be in a difficult situation. Likewise, keep reinforcements of your most significant email and documents independently.
9. On the off chance that any substantial message headers of an infection email show what server the message was sent from, contact the administration being referred to and record a proper grumbling.
10. Download & install a highly rated antivirus software like McAfee Security Suite with McAfee activate product key for complete protection of PC/Laptop
Don'ts
1. Try not to open an email connection except if you were expecting it and realize whom it's from.
2. Try not to open any spontaneous executable records, reports, spreadsheets, and so on.
3. Abstain from downloading executable or archives from the web, as these are regularly used to spread infections.
4. Never open documents with a twofold record augmentation, for example filename.txt.vbs. This is an ordinary indication of an infection program.
5. Try not to send or advance any documents that you haven't infection checked first.
6. Infections and spam
7. Infection producers and spammers frequently coordinate in naughty plans to send however much spam as could be expected as productively as would be prudent. They make infections that taint powerless PCs around the globe and transform them into spam-producing "robots". The tainted PCs at that point send gigantic measures of spam, unbeknownst to the PC proprietor.
Such infection created email is regularly manufactured to have all the earmarks of being sent from authentic tends to gathered from address books on contaminated PCs. The infections likewise utilize such information, joined with arrangements of normal (client) names, to send spam to immense quantities of beneficiaries. Huge numbers of those messages will be returned as undeliverable, and land in blameless and accidental email clients' Inboxes. On the off chance that this transpires, utilize the trainable spam channel to get those messages.
The most effective method to Get Rid Of Computer Virus
Never the disregard to make a move on a PC infection living in your framework. There are chances that you may wind up losing significant documents, projects, and envelopes. Now and again, the infection harms the framework equipment as well. Along these lines, it ends up obligatory to have a powerful enemy of infection programming introduced on your PC to avoid every such risk.
Indications of Virus Infection
It is imperative for any PC client to know about these notice signs –
• Slower framework execution
• Pop-ups shelling the screen
• Programs running without anyone else
• Files increasing/copying without anyone else
• New records or projects in the PC
• Files, envelopes or projects getting erased or tainted
• The sound of a hard drive
In the event that you run over any of these previously mentioned signs, at that point there are chances that your PC is tainted by an infection or malware. Not to delay, promptly stop every one of the directions and download an antivirus programming. In the event that you are uncertain what to do, get the help of an approved PC faculty. In the event that you are certain enough, start exploring without anyone else by following the beneath referenced bit by bit techniques.
#Safe Mode
Boot the framework and press F8 for Advanced Boot Options menu. Select Safe Mode with Networking and press Enter. You may need to keep more than once squeezing to jump on to the screen.
Chipping away at the Safe Mode helps handle accursed documents as they're not really running or dynamic. Last however not the least the web spreads the contamination, so expel the association.
#Delete Temporary Files
So as to free the plate space, erase transitory documents before beginning to run the infection check. This methodology assists speed with increasing the infection examining process. The Disk Cleanup instrument helps in erasing your brief documents on the PC.
Here is the manner by which you got the chance to approach achieving it – Start menu at that point select All Programs, presently you click on Accessories, System Tools, and afterward snap Disk Cleanup.
#Download Virus/Malware Scanner
On the off chance that you are under the feeling that an infection scanner cleanups the awful stuff from your PC then tragically, that is not valid! It helps in dispensing with standard contaminations and not adequate to evacuate the most recent hurtful diseases. The infection/malware scanner limits on the issue, in this way, download it now. So as to all the more likely ensure go for an ongoing enemy of infection program, since it naturally continues checking out of sight for infections.
P.S: Don't introduce more than one continuous enemy of infection program. In the event that you do as such, your framework will begin to carry on abnormally.
#Run a Virus/Malware Scan
Download the infection/malware scanner utilizing the web. When you have wrapped up the infection scanner, detach it for security and well being reasons. After effective download total the establishment systems of the Virus/Malware scanner, at that point start running your on-request scanner first and from that point run your continuous scanner.
The purpose behind running both is that one of them will adequately wipe out your PC infection or malware.
#Reinstall the Software or Damaged Files
When the infection expulsion from your PC is finished, feel free to reinstall the records and projects that were harmed by the infection or malware. Utilize the reinforcements for re-establishment.
In straightforward, do the reinforcements routinely and remain ensured.
Also read:- What is the need of an antivirus software?
A PC infection is a pernicious program that self-reproduces by duplicating itself to another program. As it were, the PC infection spreads independent from anyone else into other executable code or records. The reason for making a PC infection is to taint defenseless frameworks, gain administrator control and take client delicate information. Programmers structure PC infections with malevolent plan and go after online clients by deceiving them.
It is very simple and straightforward for the infections to sneak into a PC by avoiding the guard frameworks. An effective break can cause difficult issues for the client, for example, contaminating different assets or framework programming, altering or erasing key capacities or applications and duplicate/erase or scramble information.
How does a PC infection work?
A PC infection works in two different ways. The principal kind, when it arrives on another PC, starts to recreate. The subsequent sort plays dead until the trigger kick begins the malevolent code. As it were, the contaminated program needs to rushed to be executed. In this way, it is exceptionally noteworthy to remain protected by introducing a powerful antivirus program.
Generally, the complex PC infection accompanies avoidance capacities that help in bypassing antivirus programming and other propelled levels of resistances. The main role can include taking passwords or information, logging keystrokes, undermining documents, and in any event, assuming responsibility for the machine.
Along these lines, the polymorphic malware improvement as of late empowers the infections to change its code as it spreads progressively. This has made the infection discovery and distinguishing proof exceptionally testing.
The History of Computer Virus
Robert Thomas, a designer at BBN Technologies built up the principal known PC infection in the year 1971. The primary infection was initiated as the "Creeper" infection, and the trial program did by Thomas tainted centralized computers on ARPANET. The print message showed on the screens read, "I'm the creeper: Catch me on the off chance that you can."
Be that as it may, the first wild PC infection, most likely the first to be found throughout the entire existence of PC infections was "Elk Cloner." The Elk Cloner contaminated Apple II working frameworks through floppy plates. The message showed on tainted Apple Computers was an amusing one. The infection was created by Richard Skrenta, a young person in the year 1982. Despite the fact that the PC infections were structured as a trick, it likewise edified how a noxious program could be introduced in a PC's memory and prevent clients from expelling the program.
It was Fred Cohen, who authored the expression "PC infection" and it was following a year in 1983. The term appeared when he endeavored to compose a scholastic paper titled "PC Viruses – Theory and Experiments" specifying about the pernicious projects in his work.
Versions of Computer Viruses
A PC infection is one sort of malware that embeds its infection code to increase itself by modifying the projects and applications. The PC gets contaminated through the replication of malevolent code.
PC infections come in various structures to taint the framework in various manners. The absolute most normal infections are
Boot Sector Virus – This sort of infection contaminates the ace boot record and it is testing and an unpredictable assignment to evacuate this infection and regularly requires the framework to be arranged. Generally it spreads through removable media.
Direct Action Virus – This is likewise called non-inhabitant infection, it gets introduced or remains covered up in the PC memory. It remains appended to the particular kind of records that it contaminate. It doesn't influence the client experience and framework's exhibition.
Inhabitant Virus – Unlike direct activity infections, occupant infections get introduced on the PC. It is hard to recognize the infection and it is even hard to expel an inhabitant infection.
Multipartite Virus – This sort of infection spreads through different ways. It taints both the boot area and executable records simultaneously.
Polymorphic Virus – These sort of infections are hard to relate to a conventional enemy of infection program. This is on the grounds that the polymorphic infections changes its mark design at whatever point it recreates.
Overwrite Virus – This sort of infection erases every one of the documents that it taints. The main conceivable system to expel is to erase the contaminated records and the end-client needs to lose every one of the substance in it. Recognizing the overwrite infection is troublesome as it spreads through messages.
Spacefiller Virus – This is additionally called "Pit Viruses". This is called so as they top off the vacant spaces between the code and subsequently doesn't make any harm the record.
#File infectors:
Barely any record infector infections come joined with program documents, for example, .com or .exe records. Some document infector infections taint any program for which execution is mentioned, including .sys, .ovl, .prg, and .mnu records. Subsequently, when the specific program is stacked, the infection is likewise stacked.
Other than these, the other record infector infections come as a totally included program or content sent in email connections.
#Macro infections:
As the name proposes, the large scale infections especially target full scale language directions in applications like Microsoft Word. The equivalent is inferred on different projects as well.
In MS Word, the macros are keystrokes that are inserted in the archives or spared arrangements for directions. The large scale infections are intended to add their pernicious code to the certified full scale successions in a Word record. Be that as it may, as the years passed by, Microsoft Word saw handicapping of macros of course in later forms. Consequently, the cybercriminals began to utilize social building plans to target clients. All the while, they stunt the client and empower macros to dispatch the infection.
Since large scale infections are making a return the ongoing years, Microsoft immediately fought back by including another component in Office 2016. The element empowers security directors to specifically empower full scale use. In actuality, it very well may be empowered for confided in work processes and blocked whenever required over the association.
#Overwrite Viruses:
The infection configuration reason will in general shift and Overwrite Viruses are transcendently intended to pulverize a record or application's information. As the name says everything, the infection in the wake of assaulting the PC starts overwriting records with its own code. Not to be trifled with, these infections are increasingly fit for focusing on explicit documents or applications or efficiently overwrite all records on a contaminated gadget.
On the flip side, the overwrite infection is fit for introducing another code in the documents or applications which projects them to spread the infection to extra records, applications, and frameworks.
#Polymorphic Viruses:
Increasingly more cyber criminals are relying upon the polymorphic infection. It is a malware type which can change or transform its fundamental code without changing its essential capacities or highlights. This helps the infection on a PC or system to dodge identification from numerous anti malware and danger location items.
Since infection expulsion projects rely upon distinguishing marks of malware, these infections are painstakingly intended to escape discovery and ID. At the point when a security programming distinguishes a polymorphic infection, the infection changes itself in this way, it is never again discernible utilizing the past mark.
#Resident Viruses:
The Resident infection inserts itself in the memory of a PC. Fundamentally, the first infection program isn't required to taint new records or applications. In any event, when the first infection is erased, the adaptation put away in memory can be actuated. This happens when the PC OS stacks certain applications or capacities. The inhabitant infections are inconvenient because of the explanation they can run unnoticed by antivirus and antimalware programming by covering up in the framework's RAM.
#Rootkit Viruses:
The rootkit infection is a malware type which subtly introduces an illicit rootkit on a contaminated framework. This opens the entryway for aggressors and gives them full control of the framework. The aggressor will have the option to on a very basic level alter or handicap capacities and projects. Like other advanced infections, the rootkit infection is likewise made to sidestep antivirus programming. The most recent forms of major antivirus and antimalware projects incorporate rootkit examining.
#System or Boot-record Infectors:
The Boot-record Infectors taint executable code found in explicit framework zones on a circle. As the name suggests, they connect to the USB thumb drives and DOS boot segment on diskettes or the Master Boot Record on hard circles. Boot infections are not any more typical nowadays as the most recent gadgets depend less on physical stockpiling media.
Step by step instructions to Avoid Email Viruses And Worms
Here are some basic guidelines you can pursue to abstain from being tainted by infections through email.
Step by step instructions to Be Safe From Email Viruses And Worms
Here are some basic guidelines you can pursue to abstain from being contaminated by infections through email.
Do's
1. Utilize an expert, email administration, for example, Runbox. Membership administrations give more significant levels of security and backing.
2. Ensure that your Runbox infection channel is enacted.
3. Utilize the Webmail interface at www.runbox.com to peruse your email, or don't download all your email to an email customer concealed. Screen your email first, and erase suspicious-looking and undesirable messages before downloading the real email to your neighborhood email customer.
4. Ensure your PC has refreshed enemy of infection programming running locally. Programmed updates are basic for successful infection insurance. Joined with server-side filtering, you presently have two layers of security.
5. Incapacitate message see in your email customer, particularly on Windows stages. Something else, noxious projects joined to approaching messages may execute consequently and taint your PC.
6. Disregard or erase messages with connections seeming, by all accounts, to be sent from official Runbox email addresses. Runbox once in a while sends email to our clients, beside answers to request and installment updates. We for all intents and purposes never send an email with connections to clients.
7. Take alert when opening illustrations and media connections, as infections can be veiled accordingly records.
8. Keep up a few autonomous email accounts. In the event that an infection contaminates your solitary business email address, you'll be in a difficult situation. Likewise, keep reinforcements of your most significant email and documents independently.
9. On the off chance that any substantial message headers of an infection email show what server the message was sent from, contact the administration being referred to and record a proper grumbling.
10. Download & install a highly rated antivirus software like McAfee Security Suite with McAfee activate product key for complete protection of PC/Laptop
Don'ts
1. Try not to open an email connection except if you were expecting it and realize whom it's from.
2. Try not to open any spontaneous executable records, reports, spreadsheets, and so on.
3. Abstain from downloading executable or archives from the web, as these are regularly used to spread infections.
4. Never open documents with a twofold record augmentation, for example filename.txt.vbs. This is an ordinary indication of an infection program.
5. Try not to send or advance any documents that you haven't infection checked first.
6. Infections and spam
7. Infection producers and spammers frequently coordinate in naughty plans to send however much spam as could be expected as productively as would be prudent. They make infections that taint powerless PCs around the globe and transform them into spam-producing "robots". The tainted PCs at that point send gigantic measures of spam, unbeknownst to the PC proprietor.
Such infection created email is regularly manufactured to have all the earmarks of being sent from authentic tends to gathered from address books on contaminated PCs. The infections likewise utilize such information, joined with arrangements of normal (client) names, to send spam to immense quantities of beneficiaries. Huge numbers of those messages will be returned as undeliverable, and land in blameless and accidental email clients' Inboxes. On the off chance that this transpires, utilize the trainable spam channel to get those messages.
The most effective method to Get Rid Of Computer Virus
Never the disregard to make a move on a PC infection living in your framework. There are chances that you may wind up losing significant documents, projects, and envelopes. Now and again, the infection harms the framework equipment as well. Along these lines, it ends up obligatory to have a powerful enemy of infection programming introduced on your PC to avoid every such risk.
Indications of Virus Infection
It is imperative for any PC client to know about these notice signs –
• Slower framework execution
• Pop-ups shelling the screen
• Programs running without anyone else
• Files increasing/copying without anyone else
• New records or projects in the PC
• Files, envelopes or projects getting erased or tainted
• The sound of a hard drive
In the event that you run over any of these previously mentioned signs, at that point there are chances that your PC is tainted by an infection or malware. Not to delay, promptly stop every one of the directions and download an antivirus programming. In the event that you are uncertain what to do, get the help of an approved PC faculty. In the event that you are certain enough, start exploring without anyone else by following the beneath referenced bit by bit techniques.
#Safe Mode
Boot the framework and press F8 for Advanced Boot Options menu. Select Safe Mode with Networking and press Enter. You may need to keep more than once squeezing to jump on to the screen.
Chipping away at the Safe Mode helps handle accursed documents as they're not really running or dynamic. Last however not the least the web spreads the contamination, so expel the association.
#Delete Temporary Files
So as to free the plate space, erase transitory documents before beginning to run the infection check. This methodology assists speed with increasing the infection examining process. The Disk Cleanup instrument helps in erasing your brief documents on the PC.
Here is the manner by which you got the chance to approach achieving it – Start menu at that point select All Programs, presently you click on Accessories, System Tools, and afterward snap Disk Cleanup.
#Download Virus/Malware Scanner
On the off chance that you are under the feeling that an infection scanner cleanups the awful stuff from your PC then tragically, that is not valid! It helps in dispensing with standard contaminations and not adequate to evacuate the most recent hurtful diseases. The infection/malware scanner limits on the issue, in this way, download it now. So as to all the more likely ensure go for an ongoing enemy of infection program, since it naturally continues checking out of sight for infections.
P.S: Don't introduce more than one continuous enemy of infection program. In the event that you do as such, your framework will begin to carry on abnormally.
#Run a Virus/Malware Scan
Download the infection/malware scanner utilizing the web. When you have wrapped up the infection scanner, detach it for security and well being reasons. After effective download total the establishment systems of the Virus/Malware scanner, at that point start running your on-request scanner first and from that point run your continuous scanner.
The purpose behind running both is that one of them will adequately wipe out your PC infection or malware.
#Reinstall the Software or Damaged Files
When the infection expulsion from your PC is finished, feel free to reinstall the records and projects that were harmed by the infection or malware. Utilize the reinforcements for re-establishment.
In straightforward, do the reinforcements routinely and remain ensured.
Also read:- What is the need of an antivirus software?
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