A new backdoor intrusion attempts to turn Macs into bots for distributed denial-of-service (DDoS) attacks, and can also open them to other exploits, says security firm ESET. The malware is operated through IRC networks, and connects to one of a list of IRC servers so it can interpret commands received in a chat channel. Beyond turning Macs into bots, the malware can also enable file downloads by remote users, or execution of shell commands.