You can use this script for DOS Attack + DDOS Attack (using a botnet or whatever you want)
Dos / DDos using a simple python script by Astri Team. This program will obviously slow down your connection, so it's better to run it on an online shell if possible. 
If you have any issues or need help join our server.
This program is for educational purposes only and should not be used to unauthorized / illegal activities. The developer and contributors are not responsible for any misuse of this software.