Ultimate guide to DoS(Denial of Service) Attacks
- Types of Dos Attacks
- How DoS attacks work
- DoS attack tools
- How to avoid DoS
- Hacking Activity: Ping of Death
- Hacking Activity: Launch a DOS attack
- DoS– this type of attack is performed by a single host
- Distributed DoS– this type of attack is performed by a number of compromised machines that all target the same victim. It floods the network with data packets.
How DoS attacks work
- Nemesy– this tool can be used to generate random packets. It works on windows. This tool can be downloaded from http://packetstormsecurity.com/files/25599/nemesy13.zip.html . Due to the nature of the program, if you have an anti virus, it will most likely be detected as a virus.
- Land and LaTierra– this tool can be used for IP spoofing and opening TCP connections
- Blast– this tool can be downloaded from http://www.opencomm.co.uk/products/blast/features.php
- Panther- this tool can be used to flood a victim’s network with UDP packets.
- Botnets– these are multitudes of compromised computers on the internet that can be used to perform a distributed denial of service attack.
- Attacks such as SYN flooding take advantage of bugs in the operating system. Installing security patches can help reduce the chances of such attacks.
- Intrusion detection systemscan also be used to identify and even stop illegal activities
- Firewalls can be used to stop simple DoS attacks by blocking all traffic coming from an attacker by identifying his IP.
- Routers can be configured via the Access Control List to limit access to the network and drop suspected illegal traffic.
- “ping” sends the data packets to the victim
- “10.128.131.108” is the IP address of the victim
- “-t” means the data packets should be sent until the program is stopped
- “-l” specifies the data load to be sent to the victim
- Right click on the task bar
- Select start task manager
- Click on the network tab
- You will get results similar to the following
- Download Nemesy from http://packetstormsecurity.com/files/25599/nemesy13.zip.html
- Unzip it and run the program Nemesy.exe
- You will get the following interface
- 0 as the number of packets means infinity. You can set it to a desired number if you do not want to send infinity data packets
- The size field specifies the data bytes to be sent and the delay specifies the time interval in milliseconds.
- A denial of service attack’s intent is to deny legitimate users access to a resource such as a network, server etc.
- There are two types of attacks, denial of service and distributed denial of service.
- A denial of service attack can be carried out using SYN flooding, Ping of Death, Teardrop, Smurf or buffer overflow
- Security patches for operating systems, router configuration, firewalls and intrusion detection systems can be used to protect against denial of service attacks.
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