There are lots of advanced kinds 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 allow an assaulter to get control of a victim's machine; and malware that is created to take delicate information or passwords.
One especially advanced type of spyware is referred to as a rootkit. Rootkits are developed to conceal themselves from detection, and can be really challenging to eliminate when they have been installed on a system. They are frequently used to provide an assaulter complete control of a victim's device, permitting them to spy on the user, or perhaps take control of the machine from another location.
Another sophisticated type of spyware is understood as a botnet. https://geogenes.org/?p=1409 They can also be utilized to spy on users, or to take delicate information.
Spyware is ending up being significantly advanced, and intelligence companies are constantly developing their methods and tools to stay up to date with the newest hazards.