All of the top three malware families that impacted networks globally in May were previously unseen attacks according to the latest Threat Index from security firm Check Point Software. Digging a little deeper, Fireball impacted 20 percent of organizations worldwide, with second-placed RoughTed impacting 16%, and third-placed WannaCry affecting nearly 8% of organizations globally.  Malware variants Fireball and WannaCry, rapidly spread worldwide throughout the month of May.

New malware variants appeared on the scene within the top 10 of the index, including Jaff (eighth on the list), another form of ransomware–an attack vector that is proving to be quite lucrative for malicious parties.

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