I bet on "Russians".
There's a virus called "Cryptolocker" which is Russian made.
They're selling "unlocker software via bitcoin". I guess there're lots of people who caught this virus...
Did you check your pc?
If people will buy more BTC price will be rising .. no dropping..
Nope, your logic is just so simple. You're thinking one way.
These hackers collect BTC in time so Price isn't affected too much. Day traders got their purchase profit.
Then hackers dumped those BTCs.
Do you need further explanation?
No
of course now i get it
But seriously - do you think that they are earning so much?
Imagine that; "virus + spam" can reach millions of people. (let's say 2 million people got it)
Only 0.1% of it believed this spam and run it and got virus. So there's 2000 infected pc's.
If they're connected a local network; virus will spread.
Let's say; total 5000 pc's got virus.
If these people are dumb enogh to got it; They can't clean it.
So at least 50% of them have to buy the unlocker...
2500 people just pays 1 btc to buy it.
That's nearly 1 million USD. It's quite enough to crash the market.
Just a reminder; these russian guys are smart enough so they're working regional. For instance; There're ~35 million ADSL user. And most of them are using TTNet. Those guys used a phishing page to infect pc's.
TTNet published a post about it to warn customers. (In Turkish);
http://www.ttnet.com.tr/bireysel/Hakkinda/duyurular/Sayfalar/TTNET-E-Fatura-E-Mail-Bilgilendirmesi.aspxTurkey's biggest btc market published a post about this virus recently (In Turkish);
http://blog.btcturk.com/?p=2051 
http://www.ibtimes.co.uk/cryptolocker-criminals-earn-30-million-100-days-1429607
