The site rmansys.ru is the Russian site of the software. It is branded under the name RMS in Russia and CIS.
In both programs/versions, the URL in question used to be accessed by the Viewer to check the license key. Since we no longer use it, we'll remove it from the program altogether in the upcoming version 6.5.
As for Kaspersky detection, we sent a false positive request to them so hopefully they'll fix this issue soon.