Penetration Testing: [IIS 6] UNCPassword

[daemonsec-pentest () yahoo it]

Hi, 
i'm doing a penetration test from the internal lan of our customer. 
I retrieved a metabase.xml file from IIS 6 Server and i found some "UNCPassword" fields 
with an encrypted password. 

How can i crack these passwords? Is there any tool? 
Which type of ecnryption is it? 

Regards,


        

        
                
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