It is actually the same bullshit Gox bot that was identified a couple weeks ago. At least on Gox. People call it the "Willy" bot and is likely run by MtGox since it had trading access while everyone else was shut out of Gox for an hour+ last week. Most of this current rise on Gox is the Willy bot. Buys around 15btc every 7-10 minutes.
There is no indication that anybody is calling the bot "willy" and also you should be aware that there are at least 4 different official channels to send trade requests to gox: The website, the http(s) api, the socket.io API, the websocket API. Also it would not make sense for gox to buy BTC which would make the overall situation even worse, it would make much more sense for them to sell BTC and buy some of the USD that people cannot get out of there.