Security researchers at Palo Alto Networks have released a new paper titled WireLurker: A New Era in iOS and OS X Malware, which includes details about a new piece of malware that is affecting both Mac and iOS systems.
WireLurker is a trojan that has reportedly been circulating in a number of pirated pieces of software in China over the past several months. The malware appears to only target 64-bit OS X devices.
When the user installs the pirated software on his/her machine, WireLurker waits until it has root permissions and then installs itself into the OS as a system daemon (which uses libimobiledevice). The daemon sits on your machine and waits patiently until an iOS device is connected to the desktop, at which point it compromises the trusted connection between your iOS device and your Mac.