Researchers have spotted new Mac malware in the wild which uses Reddit to connect with its command and control (C&C) servers.
Russian security firm Dr Web claimed that the backdoor malware has already infected 17,000 Macs.
Although the firm didn’t reveal exactly how the malware – dubbed Mac.BackDoor.iWorm – spreads, it said that the biggest number of infected OS X machines are in the US (26%), followed by Canada (7%) and the UK (6.9%).
The malware was developed using C++ and Lua and makes “extensive use of encryption in its routines,” the firm wrote in a blog post.
“When Mac.BackDoor.iWorm is initially launched, it saves its configuration data in a separate file and tries to read the contents of the /Library directory to determine which of the installed applications the malware won't be interacting with,” Dr Web continued.
“If ‘unwanted’ directories can't be found, the bot uses system queries to determine the home directory of the Mac OS X account under which it is running, checks the availability of its configuration file in the directory, and writes the data needed for it to continue to operate into the file.”
The backdoor then opens a port on a victim machine and waits for an incoming connection.
It is at this stage that it uses Reddit to communicate with the C&C servers, the vendor said.
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