20%
Although a wide variety of tools can be used in phishing attacks, the Citadel Trojan was responsible for 20 percent of the attacks analyzed by RSA during the course of their research during the second quarter of this year. This variant of the Zeus Trojan is a particularly nasty piece of malware that downloads corresponding ransomeware, freezes up the victim's machine, and posts a fairly convincing message, purported to be from the Justice Department, that accused the user of theft of intellectual property. But if you pay the exceedingly reasonable fine of a hundred bucks, the machine will unfreeze and you can go on your merry way.
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