Eventually, we all get hacked. The bad guys are very persistent and we can all make a mistake. If you suspect you have been hacked never try to fix the situation, instead report it right away. If you try to fix the situation, such as paying an online ransom or deleting the infected files, not only could you still be hacked but you are most likely causing far more harm than good.
To learn about reporting a security incident at Northwestern, see HERE.