USBcillin is presented as a security tool for USB drives. It supposedly protects a computer from viruses that spread via removable media devices. Vendors of this application claim that USBcillin blocks malicious autorun.inf processes. Avoid installing USB cillin software on your PC. Not only it doesn’t function as anti-virus, but it is also dangerous for a computer.

USBcillin acts like a virus. It changes various registry entries; this usually affects computer’s performance speed.

Source: http://www.spywarevoid.com/remove-usbcillin-usb-cillin-removal.html