I want to create event receiver for Permission list that located at /_layouts/User.aspx page. I think if i knew
ListTemplateId of this list I would be able to handle its event. Does anyone know its
ListTemplateId and its title?
AFAIK, that information is not stored in a plain list and you cannot add even receivers when a user or group is added or permissions are assigned. Applicable to MOSS 2007 and SharePoint 2010.
Having said that, Microsoft realized a genuine need of such scenarios and made the events available in SharePoint 2013. Check this link: http://www.learningsharepoint.com/2012/08/28/sharepoint-2013-new-event-receiver-for-groupsusersrolesinheritance/