FortiGuard Labs observed that the Bitcoin mining botnet, ZeroAccess, was the number one threat last quarter.
Successful malware peddlers are always thinking up new ways of delivering malware to unsuspecting users.
An estimated 38,000 users is still infected with the Flashback Trojan, the first malware targeting Mac users that didn't have to get their permission to be downloaded, which resulted in a 600K strong botnet of computers set on redirecting Google search results and gaming Google's ad networks to earn revenue for its creator(s).
Last year's takedown of the Grum botnet was one the most fascinating ones so far, as it triggered a quick response from the botherders who tried to derail law enforcement efforts by setting up new C&C servers, but failed.
A fascinating but technically illegal experiment conducted by an anonymous researcher has witnessed over 420,000 Internet-connected devices being roped into a botnet that functioned as a distributed port scanner aimed at mapping IPv4 address usage across the Internet.
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