There are lots of sophisticated kinds of spyware used by intelligence agencies. Some of these include keyloggers, which record every keystroke made by a user; remote access tools, which permit an attacker to acquire control of a victim's device; and malware that is developed to steal sensitive information or passwords.
One particularly sophisticated kind of spyware is referred to as a rootkit. Rootkits are designed to hide themselves from detection, and can be extremely hard to remove when they have actually been installed on a system. They are frequently used to provide an attacker complete control of a victim's machine, allowing them to spy on the user, or perhaps take control of the machine remotely.
Another sophisticated type of spyware is understood as a botnet. https://heathergreenphoto.com/?p=476 They can also be utilized to spy on users, or to steal delicate information.
Spyware is ending up being progressively sophisticated, and intelligence firms are continuously progressing their tools and techniques to stay up to date with the latest hazards.