Computer virus and worms
- 1. Presented by Rishi Ram Khanal BIM 6th (108) (TU) Computer virus and worms 11/27/20201
- 2. Look ahead Introduction Types of virus How virus are active Computer worm Characteristics of warm Phases of warm and virus Virus vs warm conclusion 11/27/20202
- 3. WHAT IS COMPUTER VIRUS Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk. Viruses are most easily spread by attachments in e- mail messages or instant messaging messages. That is why it is essential that you never open e-mail attachments unless you know who it's from and you are expecting it. Viruses can be disguised as attachments of funny images, greeting cards, or audio and video files11/27/20203
- 4. OTHER TYPES OF VIRUS Bacteria Bacteria, also known as rabbits, are programs that do not directly damage the system. Bombs A bomb is actually a type of Trojan horse that can be used to release a virus or bacteria. Salami Salam is cut away tiny pieces of data. They can be particularly dangerous as the damage they do is small and can be attributed to some truncation of the system. 11/27/20204
- 5. HOW VIRUSES ACTIVE We are always afraid that viruses do something harmful to files when they get active, but not all the viruses activate. Some viruses viruses just spread out, but when viruses activate they do very different things.. Might play a part of melody or play music in the background, show a picture or animated picture, show text, format hard disk or do changes to files. 11/27/20205
- 6. COMPUTER WORMS A worm is a program that uses computer networks and security holes to replicate itself. Scans the network for another machine that has a specific security hole and copies itself Use up computer processing time and network bandwidth during replication. Carry payloads that do considerable damage. 11/27/20206
- 7. Characteristics of a Worm Enhanced Targeting Enhanced Speed Enhanced Capabilities Enhanced Destructive Power 11/27/20207
- 8. Phases of a worm or virus operation Dormant Phase Propagation Phase Triggering Phase Execution Phase 11/27/20208
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- 10. Protecting your Computer System ensure that your OS is up-to-date To have antivirus software and make sure it has the capability to scan e-mail and files as they are download from the internet Need to run full disk scans periodically Use a Firewall 11/27/202010
- 11. Thank you Any question ? 11/27/202011