Shirly, as far as I can tell, the Jazz products do not know about AD groups, except for usage as mapping against repository groups.
It would be possible to write a tool using the Java API that does this. This would involve the Plain Java Client Libraries as described in this and the following posts: http://rsjazz.wordpress.com/2013/02/28/setting-up-rational-team-concert-for-api-development/ as well as using a Java API against LDAP. Note, this is certainly not trivial. You would look up the user ID in LDAP and find the Jazz user from it. Some information about the process area API can be found here: https://rsjazz.wordpress.com/2012/12/09/analyzing-a-aroject-areas-members-and-roles-using-the-plain-java-client-libraries/ some about how to resolve users can be found here: https://rsjazz.wordpress.com/2013/01/08/maintaing-user-photos-with-the-plain-java-client-libraries/ and here: https://rsjazz.wordpress.com/2012/08/02/subscribing-to-a-work-item-using-the-java-api/