Cleanup for U6

U6 story is slightly different. For U6, StrongU has not published any ssh credentials. So most likely the virus author connected to a U6 locally using serial connection and cracked the ssh password.

Now to clean a U6, we need to be able to ssh into it. I contacted StrongU, through my vendor, and they simply refused and said ssh is disabled. In fact, of course it is not. So I connected to U6 using serial connection and figured out a way to patch the U6 official firmware package to clean the virus and also change the root password.