Answer;
-A worm
A worm spreads from one machine to another rapidly without human action.
Explanation;
-Computer worms are similar to viruses in that they replicate functional copies of themselves and can cause the same type of damage.
-In contrast to viruses, which require the spreading of an infected host file, worms are standalone software and do not require a host program or human help to propagate.
- To spread, worms either exploit a vulnerability on the target system or use some kind of social engineering to trick users into executing them.