I made an earlier post about not being able to find hackers steam ID due to them not having a community profile. After messing around I found a way to ban a hacker even if they do not have community profile. Here are the steps to find their steam ID:
Step 1: Find the hackers steam profile and Steam’s website - http://steamcommunity.com/
Step 2: Type in the users name in the “Find People” bar.
Step 3: Once you have found their profile, click on it.
Step 4: Find the link (ex. http://steamcommunity.com/profiles/76561198084842366 ) Copy it.
Step 5: Go to http://steamidfinder.com/ copy and paste the link in the bar
Step 6: If you did the steps right, there should be a box coming up that shows their steam ID
Hope this method works, it did with our case.