Transcript Virus Propagated

Computer Viruses
Standard A-4
(Safety Unit)
Need to Know
1. Computer Crimes 5. How computer viruses
and biological viruses
2. Types of
are similar
Computer Crimes
6. Prevention Methods
3. Computer Virus
4. Types of Infections 7. Anti-Virus Software
What are Computer Crimes?
• ______________committed through the use
of a computer. It can also involve the theft
of a computer and any equipment associated
with the computer.
Types of Computer Crimes
• ____________
– Conduct that involves the manipulation of a computer
or computer data in order to obtain money, property, or
value dishonestly or to cause loss.
• ______________
– Involves invading someone else’s computer, usually for
personal gain or just the satisfaction of invasion.
Other Computer Crimes
• __________________
– An employee uses a company’s computer for
personal use such as running a small business,
keeping records of an outside organization, or
keeping personal records.
• _______________
– Changing data before it is entered into the
computer or after is has been entered into the
computer.
Computer Viruses
• A ________ is a program which reproduces
itself, hides in other computer code without
permission and does nasty or undesirable
things, not intended by its victim.
• Computer viruses are called viruses because
they share some of the traits of biological
viruses. Computer viruses pass from
computer to computer like a biological virus
passes from person to person.
Types of Infection
• ____________—small piece of software that
piggybacks on real programs
• ___________—an e-mail virus moves around in email messages and usually replicates itself by
automatically mailing itself to dozens of people in the
victim’s e-mail address book
• ____________—a small piece of software that uses
computer networks and security holes to replicate itself
• ____________—a computer program that claims to do
one thing (it may claim to be a game) but instead does
damage when you run it (it may erase your hard drive)
Types of Infections
• __________
– Virus that does not cause its damage until a
certain date or until the system has been
booted a certain number of times.
• _________
– Virus triggered by the appearance or
disappearance of specified data.
An Ounce of Prevention
1.
2.
3.
Don’t share storage
devices with anyone.
Don’t download
anything from the
Internet
Install anti-virus
prevention software
on your computer.
4. Never recycle storage
devices that you know
once contained a
virus.
5. Don’t download an
attachment file from
the Internet because it
could be infected with
a virus.
An Ounce of Prevention
(continued)
6. Never double-click on an attachment that
contains an executable that arrives as an email attachment.
–
–
(Attachments that come in as Word Files (.DOC),
spreadsheets (.XLS), images (.GIF AND .JPG), etc.,
are data files and they can do no damage.
A file with an extension like EXE, COM, or VBS is an
executable, and an executable can do any sort of
damage it wants. Once you run it, you have given it
permission to do anything of your computer.
Popular
Anti-Virus Software Program
Norton (Symantec Company)
McAfee (Network Associates Company)
Command Software Systems, Inc.
Discussion Questions
1. Why do you think someone would
want to create a virus, knowing that it
would harm others and their
computers?
2. How can we prevent ourselves from
becoming a victim of a computer
virus?
Debate/Discussion
Suppose a person’s medical records were
corrupted by a computer virus, and that person
died because of faulty (or missing) medical
information.
If you were the judge, what would you decide
for the hacker who created the computer virus?
How did you come to this conclusion?
Sources
http://www.howstuffworks.com/virus.htm
http://www.cert.org/other_sources/viruses.html
(numerous resources on computer viruses,
hoaxes, antivirus software, etc.)
www.animationfactory.com (virus template for
PowerPoint)
Brainstorming Activities
1. Give examples of ways in which the
computer has become important to our
everyday lives.
2. Discuss viruses as they pertain to the
human body (illnesses), and why it is
important to contain them.
3. Discuss computer viruses and why they are
important to the health of our computers.
4. Name computer viruses.