Which cyber threats are defined incorrectly?

Denial of Service Attack $($DoS$)$: It is a type of websites assault in which an attacker floods victim$$s computer with a huge amount of data packets. It occurs when attackers obtain unauthorized access to a large number of computers on the Internet, including the target systems.

Spyware: It is a type of harmful software that infiltrates computer systems to collect personal information from users. It usually comes through compromised computers or websites.

Impersonation: In an impersonation attack, the attacker poses as a real user or server and provides false or harmful services to genuine users.

Worms: These are computer programs or files that may move from one computer to another, infecting the target computers and allowing the infection to propagate further through the Internet. The worm may not travel without the need of human intervention.