…according to a Twitter post by the Chief Informational Security Officer of Grand Canyon Education.
So, does anyone else find it odd that the file that caused everything CrowdStrike to freak out, C-00000291-
00000000-00000032.sys was 42KB of blank/null values, while the replacement file C-00000291-00000000-
00000.033.sys was 35KB and looked like a normal, if not obfuscated sys/.conf file?
Also, apparently CrowdStrike had at least 5 hours to work on the problem between the time it was discovered and the time it was fixed.
A page fault can be what triggers a catch, but you can’t unwind what a loaded module (the Crowdstrike driver) did before it crashed. It could have messed with Windows kernel internals and left them in a state that is not safe to continue. Rather than potentially damage the system, Windows stops with a BSOD. The only solution would be to not allow code to be loaded into the kernel at all, but that would make hardware drivers basically impossible.