De acordo com o Padrão de nomenclatura do Active Directory ,
Every object has a GUID which is assigned at object creation.
SID vs. GUID declara
When an object is assigned a GUID, it keeps that value for life.
Como funciona a renomeação de domínio
Each domain and application directory partition is also identified by a globally unique identifier (GUID), which does not change with a domain rename.
No meu domínio, o único GUID anexado ao objeto de domínio é "objectGUID". O atributo Object-Guid tem a dizer sobre objectGUID:
This value is set when the object is created and cannot be changed.