Zack Whittaker, writing for ZDNet: The maker of a sneaky adware that hijacks a user's browser to serve ads is back with a new, more advanced version -- one that can gain root privileges and spy on the user's activities. News of the updated adware dropped Tuesday in a lengthy write-up by Amit Serper, principal security researcher at Cybereason. The adware, dubbed OSX.Pirrit, is still highly active, infecting tens of thousands of Macs, according to Serper, who has tracked the malware and its different versions for over a year. Serper's detailed write-up is well worth the read. [...] TargetingEdge sent cease-and-desist letters to try to prevent Serper from publishing his research. "We've received several letters over the past two weeks," Serper told ZDNet. "We decided to publish anyway because we're sick of shady 'adware' companies and their threats."