The Zemra DDoS Bot is currently sold in various forums for about 100 and detected by Symantec as Backdoor.Zemra. The bot is similar to other crime packs, such as Zeus and SpyEye, in that is has a command-and-control panel hosted on a remote server. The traffic is encrypted and protected using the algorithm AES, each client communicates with a unique generated key. The DDoS bot uses a simple panel with an overview of all statistics is needed.
Source: https://thehackernews.com/2012/06/zemra-botnet-leaked-cyber-criminals.html