At least eight Eastern European banks were hacked using rogue devices planted inside the network.  These devices included cheap laptops, homemade network appliances and usb “Bash Bunnies” to intercept data and provide remote access.  Most institutions are not capable of detecting rogue devices and specialized tools such as the bash bunnies, which are usb devices are designed to emulate trusted USB devices so that they can bypass USB port restrictions that many companies use.  Once installed, they discretely exfiltrate documents, Install backdoors and perform a variety of exploits.