This week one of my standard perl [Strawberry perl 5, version 32, subversion 1 (v5.32.1) built for MSWin32-x64-multi-thread] scripts started failing. I tracked it down to a failing backtick operation.
Investigation showed that all the system-type calls, backtick, qx, pipe open, are failing. I tried building a debug version of perl, and even that fails, as the build process uses miniperl, which has the same problem.
..\miniperl.exe -I..\lib ..\make_ext.pl "MAKE=nmake -nologo" --dir=..\cpan --dir=..\dist --dir=..\ext --nonxs
Can't spawn "cmd.exe": No such file or directory at ..\make_ext.pl line 580.
Can't spawn "cmd.exe": No such file or directory at ..\make_ext.pl line 582.
Unsuccessful make(dist/if): code=65280 at ..\make_ext.pl line 584.
I tried defining PERL5SHELL (full path to cmd, pwsh in place of cmd), turning off malware protection, everything I could think of reverting.
So, the actual question: Does anyone have a suggestion for how I can track this down? It was working on Thursday, and there have been no system updates since then [OS version 10.0.22000].
Using the Malwarebytes beta (4.5.10.200) version fixes this problem for me.