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well it is more insane because if you have an elevated exe that can span other exe which would trigger smartscreen the elevated exe can actually put a smartscre
by merb 6y ago
well it is more insane because if you have an elevated exe that can span other exe which would trigger smartscreen the elevated exe can actually put a smartscreen filter in it.
I mean what is the point in smartscreening an exe that gets spawned from an elevated exe?!
- freeone3000 6y agoTo prevent virus spread by confused deputies: even if you somehow get CreateProcess permission by, ex, getting a service registered, the actual malicious executable will still be blocked.
- merb 6y agowell as said its an elevated process that can completly disable smartscreen, so an attacker would only need to run an exe that downloads another malicious exe after it disabled smartscreen that would not be blocked.
- freeone3000 6y agoImagine a program, WinSudo.exe. This program runs elevated, by magic. It passes its arguments to CreateProcess(). You call WinSudo.exe Virus.exe. Virus.exe execution is blocked by SmartScreen. (This scenario is itself a security flaw that existed for some combinations of Windows system utilities, so this is a real concern.) Now, you could change WinSudo.exe to disable SmartScreen, sure -- but this requires you to be able to modify WinSudo.exe (which should require Administrator), and the mismatched binary would ALSO flag SmartScreen.
- merb 6y agowell WinSudo.exe DisableSmartScreenAndCallVirus.exe Virus.exe might work if the first two are not smart screen detected yet. a simple program might not be detected by smartscreen yet.
- freeone3000 6y agoWhich is why the default action for unknown programs is to prompt.