OSX/Tsunami.A opens an IRC controlled backdoor that infects the victim device to become a bot for DDoS attacks and much more. Researchers at ESET analyzed the sample and realized that it contains a list of hardcoded IRC servers and channels which the virus tries to connect to. The client is exposed to receive commands from the channel, including requests to kill the knight and download a file from the web and change the spoofing to a subnet. The possibility to execute commands practically give it the power to entirely take over the infected device.”]
Source: https://news.softpedia.com/news/Linux-Tsunami-Opens-Backdoors-on-OS-X-230008.shtml