If it's still in the recycle bin, restore it and have a look. If it's not in the recycle bin, it's gone, including all it's attributes.
If it ever happens again, look before you delete.
I found a strange folder with few files created in my system DESKTOP, without my knowledge.
I saw the files and deleted the folder.
I dont know who or when it was created?
How to find the time of creation of that folder which i had deleted?