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Computer-threat researchers at Dell SecureWorks, who along with other security companies first identified the CryptoLocker attacks in September, estimate that the virus struck 250,000 computers in its first 100 days last fall. An Italian researcher who traced ransoms paid by victims in the anonymous digital currency bitcoin discovered that the hackers had set up more than 2,000 online "wallets" to accept ransoms. In three months, the researcher traced 771 ransom payments, eventually worth $1.1 million as bitcoin rose in value. Those ransoms, the researcher found, were transferred to a central online wallet on Nov. 23 that contained bitcoins worth $6 million.
More bad name to Bitcoin.
