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"Four percent may not sound like much, but it's a lot when you consider there's a new threat being created every two seconds," he told TechNewsWorld. Nevertheless, "I don't think antivirus, if modernized, is dead, because you still need to eliminate 90 percent of the noise out there, and focus your attention on how you construct your defense in depth against targeted attacks," Kellermann explained. "Everyone should use antivirus, as long as it's not solely signature-based."

The exploit consists of a specifically crafted Media Center link (.mcl) file and could be delivered to targeted users in different ways including as a download from a website, by e-mail or via instant messaging applications, the Trend Micro researchers said in a blog post Tuesday.

One of Trend's addresses was used for a profile describing a 33-year-old Los Angeles woman who is "sexy, aggressive" and "knows what she wants," wrote Ryan Flores, a threat research manager with Trend, in a blog post.

Tom Kellermann, chief cybersecurity officer at threat-intelligence firm Trend Micro, says cross-border law enforcement collaboration is at an all-time high. "The Electronic Crimes taskforces, some of which exist in Europe, are the ties that bind," he says. "Extradition is now viable, with the exception of the hacker haven that is Russia. The 78 Russian forums will remain untouchable, as they are viewed as national assets within a culture of Robin Hood."

"Companies should block all Ashley Madison related emails at the email gateway and use URL filtering for all inbound emails for those bulletproof hosts which are disseminating this crimewave," said Tom Kellermann, chief cybersecurity officer at Irving, Tex.-based Trend Micro Inc.