1. Viruses, Worms & Trojan Horses

2. What Are viruses?
They are programs which can destroy or cause damage to data stored on a computer system and to the computer itself!
Virus program must be executed in order to infect a computer system. Viruses can attach themselves to other programs in order to ensure that this happens.

3. Common Symptoms of Virus Infections
Displaying unwanted messages
Unusual visual or SFX (sound effects)
Loss of Data from a storage medium
Computers restarting unexpectedly
Unwanted generation of s

4. Viruses can ... Corrupt or delete data
Disable the computer by changing the operating system
Cause silly messages to be displayed or sounds to be produced
Use your computer to ATTACK other computer by generating spam (junk s) or overloading a company website with data.

5. WORMS Worms operate differently to viruses
Worms can spread themselves to other computers without needing to be transferred as part of a host program.
The first time a user may notice the presence of a worm is when the computers memory UNEXPECTEDLY fills up

6. Example of an email worms…
Mimail.I and Mimail.F are worms disguise themselves as an from the PayPal on-line payment service and try to steal credit cards info.
This method of fraud is known phishing

7. TROJAN HORSES
Trojan horse, also known as Trojan, describes a list of computer threats (malware) that appear to perform good functions, but actually performs malicious functions that allow unauthorized access to the hosting machine
FOR EXAMPLE – If a program is designed in such a way, it could open a gateway for hackers to control and attack the computer of the user, then that program is said to be a Trojan horse
THATS WHAT A REAL TROJAN HORSE LOOKS LIKE!

8. Lisa Robertson THANKS FOR WATCHING By Jamil Tariq , Mariya Rasul and
Jacqui Crooks 
Best teacher ever!!!!!!!! (L)