AVDEFS in my user group on my Imac

Hi SynapseMarketing,

Thanks for posting in Apple Support Communities. Is your Mac used for work or school? If your Mac is owned or managed by either, there may be a profile installed that is causing the changes that you see. Check out Intro to mobile device management profiles - Apple Support for details. You may be able to remove or have the profile removed using this guidance from the article.

"Profile removal

How you remove profiles depends on how they were installed. The following sequence indicates how a profile can be removed:

1. All profiles can be removed by wiping the device of all data.

2. If the device was enrolled in MDM using Apple School Manager, Apple Business Manager, or Apple Business Essentials, the administrator can choose whether the enrollment profile can be removed by the user or whether it can be removed only by the MDM server itself.

3. If the profile is installed by an MDM solution, it can be removed by that specific MDM solution or by the user unenrolling from MDM by removing the enrollment configuration profile.

4. If the profile is installed on a supervised device using Apple Configurator, that supervising instance of Apple Configurator can remove the profile.

5. If the profile is installed on a supervised device manually or using Apple Configurator and the profile has a removal password payload, the user must enter the removal password to remove the profile.

6. All other profiles can be removed by the user.

An account installed by a configuration profile can be removed by removing the profile. A Microsoft Exchange ActiveSync account, including one installed using a configuration profile, can be removed by the Microsoft Exchange Server by issuing the account-only remote wipe command."

If your Mac is not managed by work or school, do you have other devices that you use with this Apple ID? Although likely not related, it may be helpful to check those devices for the same issue.

Take care.

Thank you for getting back to us, SynapseMarketing!

Was the computer purchased used or refurbished? Do you use it for business or did you at one time? These are things that will need to be determined to isolate the issue further. From here we recommend reaching out to Apple Support Directly so that they can help you look further into the issue and provide a solution. We've provided a link below to contact Apple Support.

Contact - Official Apple Support

Good day!

It appears the User has some piece of Third Party Security Software installed and used on this computer

If that is correct and the name " Norton " is familiar to the user - presto !

Refer to another question over here >> Hello, Apple Community - (Users & Groups). - Apple Community

Part 1 of 2

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, in macOS 11 Big Sur, macOS 12 Monterey and macOS 13 Ventura. 

The Operating System resides in a Sealed and Read Only Volume that can not be opened by the User nor by Third Party Applications.

The only Entity that can open and modify or alter this Volume is Apple.

That would occur when a update or UpGrade is performed.

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.

The The Built in Security  is all that is required to protect the computer.

Part 2 of 2

Any of the below should be removed as per Developers Instructions

This will included Norton Antivirus 

Read some of the posting and arrive at your own conclusions.