1 / 14

Virus Basics

Virus Basics Bill Brewer—WHS CTC Joe Alvarado—WHS Tech Agenda Virus basics What to be concerned about Office protection Anti-virus messages What is a virus? A virus is a program that self-replicates It is not data You can only catch a virus by running a program

Audrey
Télécharger la présentation

Virus Basics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Virus Basics Bill Brewer—WHS CTC Joe Alvarado—WHS Tech

  2. Agenda • Virus basics • What to be concerned about • Office protection • Anti-virus messages

  3. What is a virus? • A virus is a program that self-replicates • It is not data • You can only catch a virus by running a program • Your computer runs all kinds of programs

  4. Basic virus terminology • Virus • Self-replicating • Also called a worm • Trojan Horse • A program which appears to be valuable but has an unexpected consequence

  5. How viruses get into computers • The four most common virus infections come from: • File – A virus type that infects existing files on the computer (~40%) • Macro – A virus that runs as a macro in a host application such as the MS Office applications (~35%) • VBScript – A virus that uses Windows VisualBasic Script functionality (~10%) • Internet Worm – A virus that is primarily characterized by it’s replication across the Internet (~5%)

  6. Basic virus defense • Don’t open files that you are not expecting • Many viruses automatically send files without the e-mail account owner’s knowledge. • Ask the sender to confirm unexpected files. • Suspect messages that appear more than once in your Inbox • You may receive the same e-mail from a virus repeatedly.

  7. Basic virus defense (cont.) • Learn file extensions • Your computer will display both an icon and a file extension for files you receive. Open only file extensions you know are safe.

  8. Examples of risky file types • The following file types should never be opened: • .EXE • .PIF • .BAT • .VBS • .COM

  9. Office protection • Office files are mostly data with some program code • Office macros are programs, which can be viruses • Office will prompt you to enable macros • Enable macros only when you know why office is asking

  10. Outlook file security • Outlook will automatically block some kinds of executable files, but not all • Do not assume that because the file made it through Outlook that it is safe

  11. Even Safe Files give you warnings

  12. Anti-virus warnings • Follow instructions on the screen when you receive a virus warning from Mcafee Antivirus or Computer Associates Antivirus • Most of the time, the virus software will detect and prevent the infection.

  13. Conclusion • Leave machines on at all times. Computers can be logged off but just turn off monitors. • Thank you

More Related