Cybercrime involves using computers or networks to facilitate illegal activities. There are two main types: crimes that target computer systems like malware, DoS, and DDoS attacks, and crimes that use computers as tools for other illegal acts like identity theft, fraud, and cyberstalking. Common cyber threats include computer viruses, trojans, worms, and logic bombs. DoS attacks exhaust a victim's resources to deny service, while DDoS uses multiple compromised systems or "zombies" coordinated by a handler to launch larger attacks. Phishing scams fool users into providing private information via fraudulent emails or websites. Basic protections include using firewalls, antivirus software, keeping systems updated, and being wary of un

1. Cyber Crime
Group 8
Trần Minh Dũng

2. What is Cybercrime?
• Cybercrime, or computer crime, is crime that involves
computer and network
• The computer may be used as a tool, or it may be the target
or both

3. • There are two common kind of Cybercrime:
+ Targeting computer networks or devices, including
malware and denial-of-service (DoS) attacks
+ Using computer networks as a tool to do other criminal
activities including cyberstalking, phishing and fraud or
identity theft

4. General Information about Computer Virus
• Virus is a program, a block of executable code, which attach
itself to, overwrite or replace another program in order to
reproduce itself without a knowledge of PC user
• There are different type of virus which can infect difference
parts of a system

5. Trojan
• Usually called as Trojan Horse
• Usually masked so that it look interesting
• Doing something else that the user think it would do, it could:
– Destroy system
– Stealing identity
– Money theft, ransom
– Spying, surveillance, stalking
• A kind of virus but it doesn’t reproduce

7. Worm
• Worm is a program can replicate it self. It usually spreads
over network connections
• Does not need to attach it self to another program
• Could cause ransom attack, data theft
• Usually use to install backdoor on the host computer

9. Bacteria
• Also known as rabbit
• It replicates it self until the CPU, Memory, Diskspace of the
host computer has been minimize so that the computer
become unresponsive
• Could cause denial of service

10. Logic bomb
• A type of Trojan horse can be used to release virus or
bacteria
• It only work at a specified date or condition

11. DoS basic
• DoS attack exhaust the victim’s resources, makes the victim,
site or node to deny service to its customers, using a single
host
• DDoS (Distribute DoS) is similar to DoS but using multiple
host

12. How to do DDoS attack
• Need to build a network of computer to perform DDoS
attack
– Hack into hosts, install attack tools
– Hosts running these attack tools are known as zombies
– Many zombies together form are called an army
– Building an army is automated by using Virus, Worm and Trojan
horse,…

13. • The hacker use handler(master) machines to specify type of
attack and victim’s address
• Start the attack either by remotely activating or by set time
ahead
• The slaves begin sending streams of attack packets to the
victim
• After that, the users are denied services due to lack of
resources

14. DDoS attack
• There are mainly two kinds of DDoS attacks:
– Typical DDoS attack:

15. DDoS attack
– DRDoS attack:
• Slaves send a stream of packets
with the victim’s address as the
source IP address to other
uninfected machines
(reflectors)
• Reflectors connect to the
victim and send greater volume
of traffic because they believe
the victim was asked for it

17. Phishing
• Is an Internet scam where user is fooled to give valuable
information
• There are many Phishing
method:
– Email and Spam
– Web-based Delivery
– Internet relay chat and Instant
message
– Trojan

18. Protect yourself in an online world
Using a firewall
– Firewall is a piece of software sits between computer and the
internet which allows certain types of data to cross
Scanning for malware
– Use an anti-virus program to protect yourself, turn on the
real-time scan to minimize the damage to your computer
Stay up-to-date
– Make sure that your OS and anti-virus program are up to date to
minimize the risk of being exploit

19. Thanks for listening!