There are numerous advanced types of spyware used by intelligence agencies. A few of these include keyloggers, which record every keystroke made by a user; remote gain access to tools, which permit an enemy to get control of a victim's device; and malware that is created to steal sensitive data or passwords.
One especially advanced kind of spyware is referred to as a rootkit. Rootkits are created to hide themselves from detection, and can be very challenging to get rid of as soon as they have been set up on a system. They are often used to give an opponent complete control of a victim's machine, enabling them to spy on the user, or even take control of the maker remotely.
Another sophisticated type of spyware is known as a botnet. They can also be used to spy on users, or to take delicate information.
https://creaturesincrisis.org/?p=752 Spyware is becoming increasingly sophisticated, and intelligence agencies are continuously progressing their tools and techniques to stay up to date with the current hazards.