98% of WannaCry victims were running Windows 7, not XP

"There were no real WannaCry infections of Windows XP", said Costin Raiu, director of Kaspersky Lab's global research and analysis team, in an interview Monday. "The newer Windows versions, like Windows 8.1 and Windows 10, include new security mitigations, which may have made it easier for them to [write an] exploit for Windows 7", Rauf said.

WannaCry's worm-like capacity to infect other computers on the same network with no human intervention appear tailored to Windows 7, said Paul Pratley, head of investigations and incident response at United Kingdom consulting firm MWR InfoSecurity.

As the WannaCry ransomware campaign stretches on into its second week, researchers have had more and more success developing tools to help users decrypt the files on infected PCs. We also looked at Bitcoin and how the hackers used it for ransom payments to unlock infected computers.

Microsoft took a lot of flak in the immediate aftermath of the attack due to the policies that it has on supporting older versions of Windows.

WannaCry targeted Windows systems which did not have the latest security patches from Microsoft installed, exploiting a vulnerability that was fixed in March.

Also, Signal Alliance, a Microsoft enterprise partner has issued a WannaCry ransomware advisory to its clients and key users of Windows applications across the country. Computer threats have changed and are becoming more complex.

It is also suggested to create file backup copies on a regular basis and store copies on storage devices that are not constantly connected to the computer.

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Recently, the security experts have found a brand new worm, named EternalRocks, which uses seven NSA hacking tools, compared to the two WannaCry tools.

Develop or update your organization's incident response plan to address ransomware. Windows automatically updates itself for security and bug fixes unless otherwise instructed, which means the vast majority of WannaCry infections should have been preventable.

What to do if your computer is infected?

According to a statement provided by Kaspersky, its computer system monitoring tool has detected 11 kinds of such malicious programmes that WannaCry uses to encrypt computer files.

"The exploit technique is known as HeapSpraying and is used to inject shellcode into vulnerable systems allowing for the exploitation of the system", the firm said in an advisory. Good that the Windows 10 PCs won't be affected by the WannaCry ransomware.

"We haven't seen many organisations fall over and that's because they did some of the security basics", he said.

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