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computervirus.ppt
- 1. Computer Virus Prepare by- Shripati pritam sahoo Date:-may,2023
- 2. Table of Content History What is computer virus Symptoms Types of computer virus The spread of the virus What computer virus do Preventation from computer virus Best antivirus software Conclusion
- 3. History of computer virus The first computer virus was called creeper.It was invented in the early 1970’s. Since then, millions of viruses have been invented. The first known computer virus was written in 1981 by a man named Rich Skrenta. This virus was termed Elk Cloner, and was the first computer virus to appear outside the computer where it was created in.
- 4. What is computer virus A computer virus is a malicious application used to perform destructive activity on a device or local network. The code’s malicious activity could damage the local file system, steal data, interrupt services, download additional malware, or any other actions coded into the program by the malware author.
- 5. Symptoms Your computer or web browser has dramatically slowed down over a period of a few days/a week Frequent freezing or crashing Modified or deleted files New programs or desktop icons that you do not recall installing/creating Programs running without your consent Programs closing without your consent Changes in your security settings Unusual emails/social media messages being sent without your permission to a large audience Your default search engine has been changed without you altering it New toolbars in the web browser Browser links redirect to the wrong web page
- 6. Types of Computer virus There are eight main virus types, some of which could be packaged with other malware to increase the chance of infection and damage. The 8 major categories for viruses are: 1.Boot Sector virus- A boot sector virus damages or controls the boot sector on the drive, rendering the machine unusable. 2.Direct action virus-When a user executes a harmless file attached with malicious code, direct action viruses deliver a payload immediately. 3.Web scripting virus-Most browsers have defenses against malicious web scripts, but older, unsupported browsers that allow an attacker to run code on the local device. 4.Polymorphic virus-Polymorphic viruses make it more difficult for an antivirus to detect and remove them 5.File infector virus-A threat actor uses file infector viruses to inject malicious code into critical files that run the operating system or important programs
- 7. 6.Browser hijacker- A virus that can change the settings on your browser will hijack browser favorites, the home page URL and redirect you to a malicious site 7.Resident virus- A virus that can access computer memory and sit until a payload is delivered is considered a resident virus. 8.Macro virus- Microsoft Office files can run macros, and these macros can be used to download additional malware or run malicious code. Macro viruses deliver a payload when the file is opened, and the macro runs.
- 8. Latest viruses DEXTER- Dexter is a computer virus or point of sale malware which infects computers running Microsoft Windows and was discovered by IT security, in December 2012. It infects PoS(point of sale) systems worldwide and steals sensitive information such as Credit Card and Debit Card information.
- 9. REVETON- 1.In 2012, a major ransomware know as Reveton began to spread. 2 .Reveton is a malware which attempts to extort money from a user. 3 .It Claims that your computer has been used for unauthorized activites.
- 10. CRYPTOLOCKER- 1.encrypting ransomware appeard in 2013 known as Crypto Locker. 2.cryptolocker demands a pyment with either a moneyPak card or Bitcoin to recover the key. 3.cryptolocker to be extremely difficult to repair.
- 11. The spread of the virus 1.Infected applications move from one computer to another easily because users are unaware their application is infected and will share, transfer, or install them without a care in the world. 2.Some users are unaware that their email software is being controlled by the virus (mail hijack) and viruses are actually emailing themselves to the contacts in the email contacts list. 3.Users can also download viruses if they are using pirated apps, or have accessed an infected code repository.
- 12. What does a computer virus do? The way a computer virus acts depends on how it’s coded. It could be something as simple as a prank that doesn’t cause any damage, or it could be leading to criminal activity and fraud. Many viruses only affect a local device, but others spread across a network environment to find other hosts.
- 13. How to prevent computer viruses Install antivirus software: Antivirus should run on any device connected to the network. It’s your first defense against viruses. Antivirus software stops malware executables from running on your local device. Don’t open executable email attachments: Many malware attacks including ransomware start with a malicious email attachment. Executable attachments should never be opened, and users should avoid running macros programmed into files such as Microsoft Word or Excel.
- 14. Keep your operating system updated: Developers for all major operating systems release patches to remediate common bugs . Always keep your operating system updated and stop using end-of-life versions (e.g., Windows 7 or Windows XP). Avoid questionable websites: You should always keep your browser updated with the latest patches, but avoiding these sites will stop drive-by downloads or redirecting you to sites that host malware. Don’t use pirated software: Free pirated software might be tempting, but it’s often packaged with malware. Download vendor software only from the official source and avoid using software that’s pirated and shared.
- 16. Conclusion In our technology- dependent society, the computer is the mastert it controls our entertainment, our power plants, our military and much more. However, because of the dependency on the computer and other technologies, the virus can easily do millions or even billions of dollars in damage.
- 17. THANK YOU