Find the best matches from the given definitions for the terms in the given list.
(Worm, Hacking, Phishing, Spam)
1. Unsolicited emails sent indiscriminately.
2. A technical effort to manipulate the normal behavior of networked computer system.
3. A stand alone malware program usually makes the data traffic slow.
4. Attempt to acquire information like usernames and passwords by posing as the original website.
5. Appear to be a useful software but will do damage like deleting necessary files.