is a type of malware that controls a system through a remote network connection. While desktop sharing and remote administration have many legal uses, "RAT" connotes criminal or malicious activity. A RAT is typically installed without the victim's knowledge, often as payload of a Trojan horse, and will try to hide its operation from the victim and from security software and other anti-virus software
Remote Access Trojans can be installed in a number of methods or techniques, and will be similar to other malware infection vectors. Specially crafted email attachments, web-links, download packages, or .torrent files could be used as a mechanism for installation of the software. Targeted attacks by a motivated attacker may deceive desired targets into installing such software via social engineering tactics, or even via temporary physical access of the desired computer.