Transcript Viruses, Malicious Code, & Other Nasty Stuff

Viruses, Malicious Code,
& Other Nasty Stuff
Presented by:
Melissa Dark
K-12 Outreach Coordinator
CERIAS, Purdue University
[email protected]
765.496.6762
http://www.cerias.purdue.edu/education/K-12
Software Security:
(Viruses, Trojans, Unwanted Access)
• Only install necessary and trusted
software.
• Beware of *free* games, screen savers,
and graphics.
• Keep a hard copy of the copyright
release for all “free” products!
• Run and UPDATE anti-virus software!!
Virus Growth
60000
50000
40000
30000
20000
10000
0
1988
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1988:
1990:
1993:
1999:
1990
Less than 10 known viruses
New virus found every day
10-30 new viruses per week
45,000 viruses and variants
Source: McAfee
1993
1999
Pikachu Worm: A K-12 Nightmare
This dialog box appears
after the
PIKACHUPOKEMON.EXE
file has been activated.
Worm:
• Accesses Outlook Address Book
• Embeds code to delete Windows
and Windows Subfolders upon
Restart.
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Does ask for permission to
delete files with a “Y” command.
Examples of Nasty Stuff:
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Trojan Horse
Viruses
Worms
Logic Bomb
Trapdoors
Viruses:
• Viruses: a computer program
file capable of attaching to disks
or other files and replicating itself
repeatedly, typically without user
knowledge or permission.
. ...what if the Greek soldiers in
the Trojan Horse had the
plague??
Worms:
• Worms: reproducing programs that run
independently and travel across network
connections.
Reproduction Differences:
* A virus is dependent upon a host file or boot
sector, and the transfer of files between
machines to spread.
* A worm can run completely independently
and spread of its own will through network
connections.
Trojan Horse:
• Trojan Horse: a malicious program
that pretends to be a benign
application; a Trojan horse program
purposefully does something the
user does not expect.
Trojans are not viruses since they
do not replicate, but Trojan horse
programs can be just as
destructive.
Logic Bomb:
• Logic Bomb: A logic bomb is a type
of Trojan Horse that executes when
specific conditions occur.
– Triggers for logic bombs can include
change in a file, by a particular series of
keystrokes, or at a specific time or date.
Trapdoor:
• Trapdoors: allows access to a
system by skipping the usual login
routine.
Mattel Example...
Virus Information Activity
(for students or teachers)
Directions:
• Choose one of the keywords listed on the next
slide.
• Go to the McAfee virus information library
(http://vil.mcafee.com/) and search for
information dealing with your selection.
• Skim through the choices and pick the best one
to explore! Explain what the virus is, what it will
do, and steps to fix it.
Virus Awareness
Activity: Debriefing
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Pok
Snoopy
Love
Backdoor
Bud Frogs
Anna
Bob
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Pretty
Cobra
Sorry
Funny
Perrin
Nim
Code Red