Event ID 4787

A non-member was added to a basic application group.

Subject:
    Security ID:        %6
    Account Name:       %7
    Account Domain:     %8
    Logon ID:       %9

Member:
    Security ID:        %2
    Account Name:       %1

Group:
    Security ID:        %5
    Account Name:       %3
    Account Domain:     %4

Additional Information:
    Privileges:     %10

A non-member is an account that is explicitly excluded from membership in a basic application group.  Even if the account is specified as a member of the application group, either explicitly or through nested group membership, the account will not be treated as a group member if it is listed as a non-member.