Your claim that they have expanded outside Silk Road etc, is true, but that is what was maintaining the price in the $120-$140 range prior to October.
If you look at the timeline for Cryptolocker...
From:
http://labs.umbrella.com/2013/11/05/....YdVZ9cRN.dpuf
Quote:
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Cryptolocker was first spotted in the wild as early as the first week of September. By the end of October, it had been named one of the “Internet’s Most Wanted” by all major security vendors.
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If you look at
this 2 month price history chart, it shows the steady increase of BTC prices after about Oct 12, which increased quite considerably shortly after that time, on Nov 3, which is when Cryptolocker hit its full stride.
You can ignore the relationship, but I wouldn't if I was buying BTC and waiting for a good time to sell. (Hint: Its when the guys who made cryptolocker get caught)