You do realize that it's KnC finding those blocks, right? It's not some rich yahoo in the great white north solo-mining with a few petahash... well, I guess if you consider Sweden the great white north and KnC is certainly a couple rich yahoos... lol.
Actually it came from stratum. Btcguild.com hosted in Montreal.
http://www.iplocationfinder.com/stratum.btcguild.comThe loot went to
https://blockchain.info/address/1H1sq6Msgt9HjRrBuz8ieZdThzWXS6oPVAWhen it first came out it showed 102% of network hash.
Name Server: GINA.NS.CLOUDFLARE.COM
Name Server: JOSH.NS.CLOUDFLARE.COM
Are also owned by Btcguild.
Is it possible to hijack a large cloud and make it do, sha 256 for a minute?
No, actually it came from KnC. It just happened to be relayed to blockchain.info by BTCGuild, as eleuthria explains quite well in his post.
Let me give you an example of one I know. Bock 297777 was found on April 26th. I know, because I'm the one who found it. I was mining in p2pool, and it was one of my S1s that found the block. If you look at who relayed it, you would think someone in Prague found it. I was running on my local p2pool node, in my home... and my home is not in the Czech Republic