Hello,
I would like to suggest you to have a look on below powershell script which will list of users member of those groups.
after that you can do some excel filtering to Audit the group memberships as per base line.
groups = "MYGroup1", "MYGroup2", "MYGroup3","MYGroup4"
$results = foreach ($group in $groups) {
Get-ADGroupMember $group | select samaccountname, name, @{n='GroupName';e={$group}}, @{n='Description';e={(Get-ADGroup $group -Properties description).description}}
}
$results
$results | Export-csv C:\Temp\MYGroupMemberShip.txt -NoTypeInformation
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