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Just spotted today.
It seems to be looking for the same old "fast" robot name in robots.txt. I'm assuming this because it thought it was allowed to spider my sites. But having an unrecognized user-agent string, it wasn't, and got a 403. Yeah, I fixed it! :)
No, I've just caught it at one site that had only a temporary index page up, the rest was down for a couple of months. Tiny site, I put the normal page back up on the 4th of September and the other 4 pages back up, and that user agent plus the normal one got all 5 pages between then and yesterday. It's not in Overture.