Specific to the issue at hand >>
1 - [Running] com.kaspersky.kav.plist (Kaspersky Lab UK Limited - installed 2018-10-24)
Command: /Library/Application Support/Kaspersky Lab/KAV/Binaries/kav -r -bl
A - This is what was suspected a left over that was Migrated into this computer
2 - Running] com.sophos.endpoint.scanextension - version 10.4.0 (Sophos - 2023-02-03)
Application: /Applications/Sophos/Sophos Scan.app - version 10.4.0 (Sophos - 2023-02-03)
A - There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX Foundation and Permission Limitation.
Additionally, specific to Big Sur macOS 11 and above.
The Operating System resides in a Sealed and Read Only Volume that can not be opened by the User.
The Only thing this Antivirus software is protecting is the Bank Account of the Developers and for zero return to the User aside from the problems this software creates.
AntiVirus Developers purposefully Market their product to create a “ Fear Factor “. In so doing, creating a False Need for their Product.
r
The The Built in Security is all that is required to protect the computer
Any of the below should be removed as per Developers Instructions
Sophos Av Software
Read some of the posting and arrive at your own conclusions.