I noticed in my Joomla images folder that I had two additional folders (.quarantine and .tmb) and like most, I was not sure where they came from.
However, I remembered that I just uploaded the K2 component and that must have done it. So, I began to test. I deleted the folders and then went throughout the K2 system settings to see which part of K2 generated these folders. Low and behold its the media manager. Whenever you click on the media manager it auto-generates these two folders.
To those that are worried about this, these are not virus folders and you have NOT been hacked.