Yahoo ad network is being used to spread cryptowall. BE CAREFUL WHEN CLICKING ON YAHOO ADS!
The Yahoo advertisement network has been selected by cyber-criminals to carry out a malicious advertising type of attack on unsuspecting users, by steering them to malicious pages serving a strain of CryptoWall ransom ware.
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http://blog.mspportal.net/2014/08/11/yahoo-ad-network-used-to-spread-cryptowall-ransomware/
