Viper is an extensible and customizable command and control toolkit that you can use to create trojan, backdoor, stealer, ransomware and all the other kinds of malware
Viper provides the following tools that you can use to develop your own malware (agent) and an operator client:
Viper is licensed under GPLv2, it's completely free and open source, so feel free to play around with it, And if you end up building a cool project using viper, please let me know! Maybe i'll add it to this README. Have fun!