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Computer Viruses.

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Computer Viruses

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Computer viruses explained: Definition, types, and examples

This malicious software tries to do its damage in the background while your computer still limps along..

CSO  >  What is a computer virus?

Computer virus definition

A computer virus is a form of malicious software that piggybacks onto legitimate application code in order to spread and reproduce itself.

Like other types of malware , a virus is deployed by attackers to damage or take control of a computer. Its name comes from the method by which it infects its targets. A biological virus like HIV or the flu cannot reproduce on its own; it needs to hijack a cell to do that work for it, wreaking havoc on the infected organism in the process. Similarly, a computer virus isn’t itself a standalone program. It’s a code snippet that inserts itself into some other application. When that application runs, it executes the virus code, with results that range from the irritating to the disastrous.

Virus vs. malware vs. trojan vs. worm

Before we continue a brief note on terminology. Malware is a general term for malicious computer code. A virus, as noted, is specifically a kind of malware that infects other applications and can only run when they run. A worm is a malware program that can run, reproduce, and spread on its own , and a Trojan is malware that tricks people into launching it by disguising itself as a useful program or document. You’ll sometimes see virus used indiscriminately to refer to all types of malware, but we’ll be using the more restricted sense in this article.  

What do computer viruses do?

Imagine an application on your computer has been infected by a virus. (We’ll discuss the various ways that might happen in a moment, but for now, let’s just take infection as a given.) How does the virus do its dirty work? Bleeping Computer provides a good high-level overview of how the process works. The general course goes something like this: the infected application executes (usually at the request of the user), and the virus code is loaded into the CPU memory before any of the legitimate code executes.

At this point, the virus propagates itself by infecting other applications on the host computer, inserting its malicious code wherever it can. (A resident virus does this to programs as they open, whereas a non-resident virus can infect executable files even if they aren’t running.) Boot sector viruses use a particularly pernicious technique at this stage: they place their code in the boot sector of the computer’s system disk, ensuring that it will be executed even before the operating system fully loads, making it impossible to run the computer in a “clean” way. (We’ll get into more detail on the different types of computer virus a bit later on.)

Once the virus has its hooks into your computer, it can start executing its payload , which is the term for the part of the virus code that does the dirty work its creators built it for. These can include all sorts of nasty things: Viruses can scan your computer hard drive for banking credentials, log your keystrokes to steal passwords, turn your computer into a zombie that launches a DDoS attack against the hacker’s enemies, or even encrypt your data and demand a bitcoin ransom to restore access . (Other types of malware can have similar payloads.)

How do computer viruses spread?

In the early, pre-internet days, viruses often spread from computer to computer via infected floppy disks. The SCA virus, for instance, spread amongst Amiga users on disks with pirated software . It was mostly harmless, but at one point as many as 40% of Amiga users were infected.

Today, viruses spread via the internet. In most cases, applications that have been infected by virus code are transferred from computer to computer just like any other application. Because many viruses include a logic bomb — code that ensures that the virus’s payload only executes at a specific time or under certain conditions—users or admins may be unaware that their applications are infected and will transfer or install them with impunity. Infected applications might be emailed (inadvertently or deliberately—some viruses actually hijack a computer’s mail software to email out copies of themselves); they could also be downloaded from an infected code repository or compromised app store.

One thing you’ll notice all of these infection vectors have in common is that they require the victim to execute the infected application or code. Remember, a virus can only execute and reproduce if its host application is running! Still, with email such a common malware dispersal method, a question that causes many people anxiety is: Can I get a virus from opening an email? The answer is that you almost certainly can’t simply by opening a message; you have to download and execute an attachment that’s been infected with virus code. That’s why most security pros are so insistent that you be very careful about opening email attachments, and why most email clients and webmail services include virus scanning features by default.

A particularly sneaky way that a virus can infect a computer is if the infected code runs as JavaScript inside a web browser and manages to exploit security holes to infect programs installed locally. Some email clients will execute HTML and JavaScript code embedded in email messages, so strictly speaking, opening such messages could infect your computer with a virus . But most email clients and webmail services have built-in security features that would prevent this from happening, so this isn’t an infection vector that should be one of your primary fears.

Can all devices get viruses?

Virus creators focus their attention on Windows machines because they have a large attack surface and wide installed base. But that doesn’t mean other users should let their guard down. Viruses can afflict Macs, iOS and Android devices, Linux machines, and even IoT gadgets. If it can run code, that code can be infected with a virus.

Types of computer virus

Symantec has a good breakdown on the various types of viruses you might encounter , categorized in different ways. The most important types to know about are:

  • Resident viruses infect programs that are currently executing.
  • Non-resident viruses , by contrast, can infect any executable code, even if it isn’t currently running
  • Boot sector viruses infect the sector of a computer’s startup disk that is read first , so it executes before anything else and is hard to get rid of
  • A macro virus infects macro applications embedded in Microsoft Office or PDF files. Many people who are careful about never opening strange applications forget that these sorts of documents can themselves contain executable code. Don’t let your guard down!
  • A polymorphic virus slightly changes its own source code each time it copies itself to avoid detection from antivirus software.
  • Web scripting viruses execute in JavaScript in the browser and try to infect the computer that way.

Keep in mind that these category schemes are based on different aspects of a virus’s behavior, and so a virus can fall into more than one category. A resident virus could also be polymorphic, for instance.

How to prevent and protect against computer viruses

Antivirus software is the most widely known product in the category of malware protection products. CSO has compiled a list of the top antivirus software for Windows , Android , Linux and macOS , though keep in mind that antivirus isn’t a be-all end-all solution . When it comes to more advanced corporate networks, endpoint security offerings provide defense in depth against malware . They provide not only the signature-based malware detection that you expect from antivirus, but antispyware, personal firewall, application control and other styles of host intrusion prevention. Gartner offers a list of its top picks in this space , which include products from Cylance, CrowdStrike, and Carbon Black.

One thing to keep in mind about viruses is that they generally exploit vulnerabilities in your operating system or application code in order to infect your systems and operate freely; if there are no holes to exploit, you can avoid infection even if you execute virus code. To that end, you’ll want to keep all your systems patched and updated, keeping an inventory of hardware so you know what you need to protect, and performing continuous vulnerability assessments on your infrastructure.

Computer virus symptoms

How can you tell if a virus has slipped past your defenses? With some exceptions, like ransomware, viruses are not keen to alert you that they’ve compromised your computer. Just as a biological virus wants to keep its host alive so it can continue to use it as a vehicle to reproduce and spread, so too does a computer virus attempt to do its damage in the background while your computer still limps along. But there are ways to tell that you’ve been infected. Norton has a good list ; symptoms include:

  • Unusually slow performance
  • Frequent crashes
  • Unknown or unfamiliar programs that start up when you turn on your computer
  • Mass emails being sent from your email account
  • Changes to your homepage or passwords

If you suspect your computer has been infected, a computer virus scan is in order. There are plenty of free services to start you on your exploration: The Safety Detective has a rundown of the best.

Remove computer virus

Once a virus is installed on your computer, the process of removing it is similar to that of removing any other kind of malware—but that isn’t easy. CSO has information on how to remove or otherwise recover from rootkits , ransomware , and cryptojacking . We also have a guide to auditing your Windows registry to figure out how to move forward.

If you’re looking for tools for cleansing your system, Tech Radar has a good roundup of free offerings , which contains some familiar names from the antivirus world along with newcomers like Malwarebytes. And it’s a smart move to always make backups of your files , so that if need be you can recover from a known safe state rather than attempting to extricate virus code from your boot record or pay a ransom to cybercriminals.

Computer virus history

The first true computer virus was Elk Cloner , developed in 1982 by fifteen-year-old Richard Skrenta as a prank. Elk Cloner was an Apple II boot sector virus that could jump from floppy to floppy on computers that had two floppy drives (as many did). Every 50th time an infected game was started, it would display a poem announcing the infection.

Other major viruses in history include:

  • Jerusalem : A DOS virus that lurked on computers, launched on any Friday the 13th, and deleted applications.
  • Melissa : A mass-mailing macro virus that brought the underground virus scene to the mainstream in 1999. It earned its creator 20 months in prison.

But most of the big-name malware you’ve heard of in the 21st century has, strictly speaking, been worms or Trojans, not viruses. That doesn’t mean viruses aren’t out there, however—so be careful what code you execute.

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Josh Fruhlinger

Josh Fruhlinger is a writer and editor who lives in Los Angeles.

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PowerPoint Presentation on Computer Virus and Google Slides

PowerPoint Presentation on Computer Virus and Google Slides

Computer Virus presentation slide

A computer virus is a type of malicious software that can infect a computer and cause a wide range of problems, from slowing down performance to stealing sensitive information. Viruses can spread quickly and easily through email attachments, software downloads, and other online sources. Once a virus infects a computer, it can replicate itself and spread to other computers on the same network. Some viruses are designed to be stealthy, making them difficult to detect and remove. To protect against computer viruses, it's important to use antivirus software and keep your operating system and other software up to date. It's also important to be cautious when downloading and opening files from the internet or unknown sources. You can use this template if you want to explain this idea to your audience.

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COMPUTER VIRUS

Jan 01, 2020

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COMPUTER VIRUS. a complete study. Compiled By : S. Agarwal, Lecturer & Systems Incharge St. Xavier’s Computer Centre, St. Xavier’s College Kolkata February, 2003. What is a Virus ?

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COMPUTER VIRUS a complete study.... Compiled By : S. Agarwal, Lecturer & Systems Incharge St. Xavier’s Computer Centre, St. Xavier’s College Kolkata February, 2003 Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

What is a Virus? A virus is just a computer program. Like any other program, it contains instructions that tell your computer what to do. But unlike an application, a virus usually tells your computer to do something you don't want it to do, and it can usually spread itself to other files on your computer -- and other people's computers. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

In some cases, a virus will execute only a gentle "personality quirk," such as causing your computer to make seemingly random bleeps. But a virus can be very destructive; it could format your hard drive, overwrite your hard drive boot sector, or delete files and render your machine inoperable. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

General virus types While there are thousands of variations of viruses, most fall into one of the following general categories, each of which works slightly differently. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Boot Sector Virus: Replaces or implants itself in the boot sector. This kind of virus can prevent you from being able to boot your hard disk. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Macro Virus: Written using a simplified macro programming language, these viruses affect Microsoft Office applications, such as Word and Excel. A document infected with a macro virus generally modifies a pre-existing, commonly used command (such as Save) to trigger its payload upon execution of that command. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Multipartite Virus Infects both files and the boot sector-- a double whammy that can reinfect your system dozens of times before it's caught. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Polymorphic Virus: Changes code whenever it passes to another machine. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Stealth Virus: hides its presence by making an infected file not appear infected Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

E-mail viruses: An e-mail virus moves around in e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Worms: A worm is a computer program that has the ability to copy itself from machine to machine. Worms normally move around and infect other machines through computer networks. Worms eat up storage space and slows down the computer. But worms don't alter or delete files. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Trojan horses : A Trojan horse is simply a computer program that claims to do one thing (it may claim to be a game) but instead does damage when you run it (it may erase your hard disk). Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

When loaded onto your machine, a Trojan horse can capture information from your system -- such as user names and passwords or could allow a malicious hacker to remotely control your computer. Trojan horses have no way to replicate automatically. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Origins of Viruses : People create viruses. A person has to write the code, test it to make sure it spreads properly and then release the virus. A person also designs the virus's attack phase, whether it's a silly message or destruction of a hard disk. In most of the cases people create viruses just for the thrill or fun. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

How They Spread ? Early viruses were pieces of code attached to a common program like a popular game or a popular word processor. A person might download an infected game from the internet or copy it from a floppy disk and run it. A virus like this is a small piece of code embedded in a larger, legitimate program. Any virus is designed to run first when the legitimate program gets executed. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

The virus loads itself into memory and looks around to see if it can find any other programs on the disk. If it can find one, it modifies it to add the virus's code to the unsuspecting program. Then the virus launches the "real program." The user really has no way to know that the virus ever ran. Unfortunately, the virus has now reproduced itself, so two programs are infected. The next time either of those programs gets executed, they infect other programs, and the cycle continues. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

If one of the infected programs is given to another person on a floppy disk, or if it is uploaded to internet, then other programs get infected. This is how the virus spreads. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

The spreading part is the infection phase of the virus. Viruses wouldn't been so violently disliked if all they did was replicate themselves. Unfortunately, most viruses also have some sort of destructive attack phasewhere they do some damage. Some sort of trigger will activate the attack phase, and the virus will then "do something" -- anything from printing a silly message on the screen to erasing all of your data. The trigger might be a specific date, or the number of times the virus has been replicated, or something similar. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

SOME TRICKS THE VIRUSES PLAY : One important trick is the ability to load viruses into memory so that they can keep running in the background as long as the computer remains on. This gives viruses a much more effective way to replicate themselves. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Another trick is the ability to infect the boot sector on floppy disks and hard disks. The boot sector is a small program that is the first part of the operating system that the computer loads and tells the computer how to load the rest of the operating system. By putting its code in the boot sector, a virus can guarantee that it gets executed. It can load itself into memory immediately, and it is able to run whenever the computer is on. Boot sector viruses can infect the boot sector of any floppy disk inserted in the machine, and on campuses where lots of people share machines they spread like wildfire. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

In general, both executable and boot sector viruses are not very threatening any more. The first reason for the decline has been the huge size of today's programs. The programs are so big that the only easy way to move them around is in CDs. People certainly can't carry applications around on a floppy disk like they did in the early days. Compact discs cannot be modified, and that makes viral infection of a CD impossible. Boot sector viruses have also declined because operating systems now protect the boot sector. Both boot sector viruses and executable viruses are still possible, but they are a lot harder now and they don't spread nearly as quickly as they once could. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Prevention is the best cure : Run a secure operating system like UNIX or Windows NT. Install virus protection software. Avoid programs from unknown sources. Disable floppy disk booting Macro Virus Protection is enabled in all Microsoft applications. Never double-click on an attachment that contains an executable that arrives as an e-mail attachment. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

How antivirus software works : Scanning software looks for a virus in one of two ways. If it's a known virus (one that has already been detected in the wild and has an antidote written for it) the software will look for the virus's signature -- a unique string of bytes that identifies the virus like a fingerprint -- and will zap it from your system. Most scanning software will catch not only an initial virus but many of its variants as well, since the signature code usually remains intact. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

In the case of new viruses for which no antidote has been created, scanning software uses methods that look for unusual virus like activity on your system. If the program sees any funny business, it quarantines the questionable program and broadcasts a warning to you about what the program may be trying to do (such as modify your Windows Registry). If you and the software think the program may be a virus, you can send the quarantined file to the antivirus vendor, where researchers examine it, determine its signature, name and catalog it, and release its antidote. It's now a known virus. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

If the virus never appears again -- which often happens when the virus is too poorly written to spread -- then vendors categorize the virus as dormant. But viruses are like earthquakes: The initial outbreak is usually followed by aftershocks. Variants (copycat viruses that emerge in droves after the initial outbreak) make up the bulk of known viruses. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Practice safe computing The best way to protect yourself from viruses is to avoid opening unexpected e-mail attachments and downloads from unreliable sources. Resist the urge to double-click everything in your mailbox. If you get a file attachment and you aren't expecting one, e-mail the person who sent it to you before you open the attachment. Ask them if they meant to send you the file, what it is, and what it should do. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

For added safety, you need to install reliable antivirus scanning software and download updates regularly. Major antivirus software vendors, including Symantec, Network Associates, Computer Associates, and Trend Micro, provide regular updates. (Computer Associates' InoculateIT is also free.) Some of the vendors also offer a service that will automatically retrieve updates for you from the company's Web site. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Regular updates are essential. Researchers at Computer Economics estimate that 30 percent of small businesses are vulnerable to viruses either because they don't keep their virus-scanning software updated or because they don't install it correctly. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

Wishing you : Safe & Happy Computing..... S. Agarwal Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected]

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Powerpoint Templates and Google slides for Computer Viruses

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    Computer Virus presentation slide. A computer virus is a type of malicious software that can infect a computer and cause a wide range of problems, from slowing down performance to stealing sensitive information. Viruses can spread quickly and easily through email attachments, software downloads, and other online sources. ...

  11. Computer Viruses and Malwares

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  13. 100+ Computer viruses PowerPoint (PPT) Presentations ...

    Understanding Computer Viruses: What They Can Do, Why People Write Them and How to Defend Against Them. Classroom Activities Guide. What is a computer virus?. A computer virus is a malicious program that spreads from computer to computer. . Viruses, Worms, Trojan Horses. ★ ★ ★ ★ ★

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    A computer virus is a parasitic program that infects another legitimate program, which is sometimes called the host. To infect the host program, the virus modifies the host to store a copy of the virus. Many viruses are programmed to do harm once they infect the victim's system. To qualify as a virus, a program must be able to replicate (make ...

  16. Computer virus and anti virus presentation

    6. Like any other field in computer science viruses have evolved over the years. The first computer virus was called 'Creeper'. It was invented in the early 1971 by Bob Thomas. This program has been designed not to damage the computer, but only to display a messages. Since then, millions of viruses have been invented. History of Virus

  17. 20 Best Computer Viruses-Themed Templates

    20 Best Computer Viruses-Themed Templates. CrystalGraphics creates templates designed to make even average presentations look incredible. Below you'll see thumbnail sized previews of the title slides of a few of our 20 best computer viruses templates for PowerPoint and Google Slides. The text you'll see in in those slides is just example text.

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    Oh no! A virus has entered this template! Check your data protection settings and change all your passwords… and check out this modern computer virus minitheme, illustrated with viruses and bugs! Perfect for any cyber security-related presentation, all its slides are fully customizable to make your content shine and their...

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    E-mail viruses: An e-mail virus moves around in e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book. Compiled by : S. Agarwal, Lecturer & Systems Incharge, St. Xavier's Computer Centre, Kolkata : [email protected].

  20. Computer Viruses PowerPoint Presentation and Slides

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