So, I need to connect to SSH server through proxy socks.
I read paramiko and twisted.conch docs, but didn`t found proxy socks support there.
This socket-wrapper allows you to use static ssh-tunnels. I found a common solution for my problem:

Use paramiko SSHClient class
Extend SSHClient with your own class
Re-implement the connect() method: 
Instead of using a standard socket object we pass to it a fixed proxied socket from the python package sockipy
Python ssh client over socks (proxy)