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The Dridex botnet operators have recently changed the delivery mechanism in their spam campaigns, as well as the payload, to deliver the Locky ransomware, researchers at Trustwave warn.
The security firm has observed a massive spam campaign of over 4 million malware spams, with malware accounting for 18 percent of the total spam detected. A recent blog post from TrustWave's Rodel Mendrez also reveals that the campaign was not continuous, but done it concentrated bursts, with peaks of 200K emails hitting servers in a single hour.