The malware, a type of botnet, is also capable of launching DDoS attacks. A coordinated DDoS attack by multiple botnet machines also resembles a zombie horde attack. CryptoLocker was also propagated using the Gameover ZeuS trojan and botnet. DoS attacks often use bots (or a botnet) to carry out the attack. The bot herder may set the channel's topic to command the botnet. It propagated via infected email attachments, and via an existing Gameover ZeuS botnet. The compromised machine becomes merged into a botnet. It offers enhanced exploit blocking and botnet detection. The Mirai Botnet had infected roughly 65,000 IoT devices within the first 20 hours. It adds exploit blocking for Java and botnet protection. It targets computers that use Microsoft Windows, recruiting a network of zombies for the botnet. Removing such services can cripple an entire botnet. However, there is controversy surrounding the Kraken botnet. It is believed to have been spread through use of the Cutwail botnet. The report goes into great detail about how the botnet operates.