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Virus Basics PowerPoint PPT Presentation

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

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Virus Basics

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Virus basics l.jpg

Virus Basics

Bill Brewer—WHS CTC

Joe Alvarado—WHS Tech


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Agenda

  • Virus basics

  • What to be concerned about

  • Office protection

  • Anti-virus messages


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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


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Basic virus terminology

  • Virus

    • Self-replicating

    • Also called a worm

  • Trojan Horse

    • A program which appears to be valuable but has an unexpected consequence


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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%)


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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.


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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.


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Examples of risky file types

  • The following file types should never be opened:

    • .EXE

    • .PIF

    • .BAT

    • .VBS

    • .COM


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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


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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


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Even Safe Files give you warnings


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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.


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Conclusion

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

  • Thank you


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