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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

Virus Basics

Bill Brewer—WHS CTC

Joe Alvarado—WHS Tech

agenda
Agenda
  • Virus basics
  • What to be concerned about
  • Office protection
  • Anti-virus messages
what is a virus
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
basic virus terminology
Basic virus terminology
  • Virus
    • Self-replicating
    • Also called a worm
  • Trojan Horse
    • A program which appears to be valuable but has an unexpected consequence
how viruses get into computers
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%)
basic virus defense
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.
basic virus defense cont
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.
examples of risky file types
Examples of risky file types
  • The following file types should never be opened:
    • .EXE
    • .PIF
    • .BAT
    • .VBS
    • .COM
office protection
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
outlook file security
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
anti virus warnings
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.
conclusion
Conclusion
  • Leave machines on at all times. Computers can be logged off but just turn off monitors.
  • Thank you