Gh0st RAT is a Trojan horse for the Windows platform that the operators of GhostNet used to hack into some of the most sensitive computer networks on Earth. It is a cyber spying computer program. The "Rat" part of the name refers to the software's ability to operate as a "Remote Administration Tool".The GhostNet system disseminates malware to selected recipients via computer code attached to stolen emails and addresses, thereby expanding the network by allowing more computers to be infected.