Unknown detection, can't find anything about it at all

“WAT:Blacked-E” was detected in a System Restore archive and deleted.

Cool. Only, I’ve never heard of a WAT type virus/worm/etc, and I can find absolutely (literally) nothing about the type, nor the virus itself. No search result has come up with anything related to this detection.

Help?

Search for the file name.
Could be that is telling you more.