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Infection Nuts and bolts
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Infection Nuts and bolts Charge Brewer—WHS CTC Joe Alvarado—WHS Tech Plan Infection nuts and bolts What to be worried about Office insurance Against infection messages What is an infection? An infection is a project that self-repeats It is not information You can just discover an infection by running a system
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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 • Your computer runs all kinds of programs
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 • 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 • 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.) • 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 • The following file types should never be opened: • .EXE • .PIF • .BAT • .VBS • .COM
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 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 • 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 • Leave machines on at all times. Computers can be logged off but just turn off monitors. • Thank you