I did this test:
https://www.trustprobe.com/fs1/download.php?appname=qmc.zip
The developer writes that the tool:
QuoteUse MITM Checker to determine if your system is currently under a MITM attack. The program will connect to a list of major websites and alert on any unknown or unusual certificates used in the SSL handshake.
It will detect obvious cases (such as interception by a local proxy, your employer's SSL inspection gateways, or a malware infection), as well as more advanced attacks (for instance, if the cert is valid but originates from an unusual organization/country).
The tool is a standalone, browser-independent application.
My result is 14 Handshake failure.
Can I get 0 Handshake failure?