viruses and anti-viruses, computer battles

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viruses and anti-viruses, computer battles

  1. 1. 1. DEFINITION OF COMPUTER VIRUS 2. TYPES OF COMPUTER VIRUSES 3. EXPLANATION OF COMPUTER VIRUSES 4. DEFINITION OF COMPUTER ANTI-VIRUS 5. TYPES OF COMPUTER ANTI-VIRUSES 6. EXPLANATION OF ANTI-VIRUSES 7. TOP FIVE COMPUTER ANTI-VIRUSES
  2. 2. A computer virus has been defined as a set of computer instructions that reproduces itself and it may attach to other executable code. Usually this code is a short program that may either embed in other code or stand on it's own. In essence, this computer program is designed to infect some aspect of the host computer and then copy itself as much and as often as it has the chance.
  3. 3. COMPUTER VIRUSES BOOT SECTO R VIRUS FILE INFECTIO N VIRUS MULTIPART EMAI NETWORK ITE L VIRUS VIRUS VIRUS MACR O VIRUS
  4. 4. BOOT VIRUS: Viruses that aim at the boot sector of a hard drive are infecting a very crucial component of the boot process. Examples, Polyboot.B and AntiEXE. FILE INFECTION VIRUS: These infect executable program files, such as those with extensions like .BIN, .COM, .EXE, .OVL, .DRV (driver) and .SYS (device driver). Examples, Sunday and Cascade. MULTIPARTITE VIRUS: Viruses that are both a file virus and a boot sector virus. They enter the computer via various sorts of media and then embed themselves in the system memory. They then go into the hard drive and infect the boot sector. Examples, Invader, Flip, and
  5. 5. NETWORK VIRUS: A virus that is especially made for networks is uniquely created to quickly spread throughout the local area network and generally across the internet as well. Examples , Christmas tree and wank worm. EMAIL VIRUS: A e-mail virus is one of those types of computer viruses that is generally a macro virus and it will multiply itself by seeking out the other contacts in a e-mail address book. Examples , ILOVEYOU and Melissa. MACRO VIRUS; A macro virus is a new type of computer virus that infects the macros within a document or template. When you open a word processing or spread sheet document, the macro virus is
  6. 6. Antivirus software is used to prevent, detect, and remove malware and other computer viruses. Anti virus software systems detections involve searching for known malicious patterns in executable code. It is possible for a user to be infected with new viruses that have no sign or symptoms or existence.
  7. 7. CONVENTIONAL DISK SCANNERS: This is the standard virus check program. It is run when the user requests it, and it scans the contents of the disks, directories or files that the user wants, for any boot sectors and/or files that contain viruses that it recognizes, based on the virus description information in its virus definition files. MEMORY RESIDENT SCANNERS: Some antivirus software now comes with a special program that sits in the background while you use your PC and automatically scans for viruses based on different triggers. START UP SCANNERS: Antivirus products often come with a special program that is designed to be run every time the PC is booted up. INOCULATION: This is a totally different approach to virus detection. Instead of looking for the viruses themselves, this technique looks for the changes that the viruses make to files and boot sectors.
  8. 8. 1. 2. 3. 4. 5. AVG. McAFEE. NORTON (SYMANTEC). KASPERSKY. AD AWARE.

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