Computer systems and their contents can be attacked in many ways, including through malicious software like viruses, worms, Trojan horses, and spyware. Viruses infect computers and replicate, worms transfer themselves through networks to infect other computers, Trojan horses disguise themselves as desirable programs to gain access and do harm, and spyware collects user information without consent. Other common attacks are phishing scams, denial of service attacks that overload systems, and spam emails.

1. SECURITY (FORMS
OF ATTACKS)
Networking and the
Internet

2. Attacks
Security (Forms of Attacks)
Computer Systems and its
contents can be attacked by
many ways
Many of these incorporates the
Malicious Software (Malware)

3. Malicious Software Types
Viruses
Worms
Trojan Horses
Spyware
Security (Forms of Attacks)

4. Virus
A virus is software that infects a
computer by inserting itself into
program that already reside in
the machine.
When host is executed, virus
also executed.
Degrading portions of OS,
erasing large blocks of mass
storage, corrupting data and
Security (Forms of Attacks)

5. Worms
A worm is an autonomous
program that transfers itself
through a network, taking up
residence in computers and
forwarding copies of itself to
other computers.
Security (Forms of Attacks)

6. Trojan Horse
A Trojan horse is a program that
enters a computer system disguised
as a desirable program, such as a
game or useful utility package, that
is willingly imported by the victim.
Starts immediate or wait for some
event,
Normally transferred using email
attachments.
Security (Forms of Attacks)

7. Spyware
 Sniffing Software.
collects information about activities at
the computer
on which it resides and reports that
information back to the instigator of the
attack.
 Companies use to make customer
profile.
 Searching passwords and credit card
numbers
Security (Forms of Attacks)

8. Phishing
Unlike spyware asking explicitly
the required information normally
using an email from so-called
Government, law-enforcement
agency, financial institute, etc
Security (Forms of Attacks)

9. Denial of Service (DOS) attacks
process of overloading a
computer with messages
an attacker usually plants
software on numerous
unsuspecting computers (botnet)
that will generate messages when
a signal is given.
Security (Forms of Attacks)

10. Spam
Unwanted Junk emails.
Medium for phishing
and Trojan horses.
Security (Forms of Attacks)

11. Summary
Security (Forms of Attacks)
Viruses
Worms
Trojan Horses
Spyware
Phishing
DOS
SPAM