As many as 162,800 computers in 150 countries remain infected as a result of the hacker attack utilizing the WannaCry malware.
13 May — 85,600,
14 May — 115,700,
15 May — 51,500,
16 May — 86,200.
What the malware does:
the virus connects to a PC that runs OS Windows,
demands a ransom of $300-600,
the hackers threaten to double the ransom after three days,
the hackers threaten to make encryption irreversible after one week.
Microsoft released a security update on 14 March 2017 to protect Windows PCs from the virus.
As a preventive measure:
do not click questionable URLs,
keep your antivirus up to date
back up critical data to external hard drives.
Source: MalwareTech and public sources.