where do apps look for installed patch

[vinifera]

so recently some browsers and antiviruses started to sniff if user has SHA-2 patch installed
but what values and where do they look for this ?

is this a specific registry entry or what ?

[25495k]

they check if the SHA-2 update is installed on your windows 7 machine

[vinifera]

...

thats not what i asked

 

Edited June 5, 2022 by vinifera

[Tripredacus]

As in, is it looking for a file, a file attribute (version) or at a registry key? It may be annoying due to how heavy a browser is, but the first thing I would attempt is to run a procmon trace on the browser when it is opened. I am presuming it is when opening the browser that it does the check, but if you know it does it at some other time, you can just limit the trace to that instead.

[TSNH]

I think they may use registry keys in "HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing", however I've never tested this.

Edited June 6, 2022 by TSNH

[vinifera]

i thought that too but update itself doesn't give you a specific component, it patches alot of things
therefore you get ALOT of reg keys