Ok, this is pretty straight forward no magic:
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Got a shell, doesn't have to be SYSTEM
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Add a route to the internal range or directly to the host you want over the session you want
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Mosy on over to the Socks4a module. And in another terminal we need to make sure our proxychains.conf file in /etc/ or where ever you store your conf is correct.
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It defaults to 9050 on 127.0.01 for Tor, that's pretty easy to cope with and no reason to mess with it if you actually use it for Tor for other things.
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Run the socks proxy with the Tor-like settings. (Remember to shutdown Tor first)
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And the rest is gravy. The % (percent sign if blog software mangles it) is a delimiter that smbclient and other samba tools recognize between user and password (so it doesn't prompt you for it).
And just to love it working:
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yay files.. Yes I know I didn't use smbmount but it works the same as well as rpcclient.
A side note here is if you are using the pth-tools from:
https://code.google.com/p/passing-the-hash/
You can use hashes instead of passwords for stuff like this. But who are we kidding? Who doesn't get clear text passwords anymore ;-)