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The arrest of Vinnik adds a new twist to the case against Karpeles, the former head of Mt. Gox, said Mark Nunnikhoven, vice president of cloud research at Trend Micro.

"If you look at the demands they are relatively low — they are in the ballpark of what people can afford to pay," says Bharat Mistry, a Trend Micro cybersecurity consultant. In fact, 65 percent of companies pay a ransom when they are hit by ransomware, according to Trend Micro's research.

A piece of malware spotted by Trend Micro in early July leverages the SambaCry vulnerability to target NAS devices, particularly ones used by small and medium-size businesses.

The tools tactics and procedures used by hacking group CopyKittens are explained in a new in-depth report produced in collaboration by cyber-security firms Trend Micro and ClearSky.

“The data GhostCtrl steals is extensive, compared to other Android info-stealers,” explained Trend Micro cyber security researchers.