Windows Logon Logs deleted [closed]

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I have some how lost my Security Logs prior to today 01:57:11 pm. The file size I had assigned to Security Logs was 160MB. Today (maybe due to virus) I have 273,692 new logs in just few hours so all previous logs are lost. The policy I set was to overwrite oldest logs if file size exceeded. I saved them as csv file and the .csv file size is about 150MB. and the logs count upto 273694 In C:\Windows\System32\winevt\Logs Security has 160MB.

I have attached the picture for reference. All I need is: Logon logs on this computer from 12 hours prior to the last Security event log time.

Can anyone help me how to resolve this problem.

Thanks

Answer 1

I checked the logon Group Policy event logs. From that i was able to see missing users on whom the logon group policy was applied to.