One week after WannaCry's attack, the analysis of the data collected shows that the most malicious software was Windows 7 and not Windows XP, according to Kaspersky security firm.
Specifically, over the 60% + 31% of the computers hit by WannaCry ran 64 or 32 bits (respectively) of the Windows 7 operating system.
Ironically, Windows 7 was meant to be safe against WannaCry, as Microsoft had made security patches available since March 2017. We should also not forget that the operating system it is supposed to still be supported.
On the other hand, seeing Windows 7 as the most influenced operating system by WannaCry malware shows it makes sense. Because if you think it's the world's top PC operating system with a market share of almost 50% it seems to be the right percentage.
This means that almost 1 on 2 desktop systems run with Window 7.
It's also worth mentioning that Windows 7 is released in pirated copies on a lot of systems out there, especially in countries like China and Russia, which still use non-genuine copies of the operating system.
This results in those using them not being able to update every month, while many are users that have completely blocked updates to avoid checking for genuine product keys.
Note that Windows 7 will continue to be supported by January of 2020, so genuine systems with this operating system will still receive updates for almost 3 years.
