Since Visum 12.5 there is the add-In 'Import Cube network' by Scripts -> VisumAddIn -> Import.
The import of CUBE consideres the following network objects - nodes, areas, lines, connections and PuT lines. Additionally, turn attributes like penalties and prohibited turns can be read in. Required files: 1) ASRI shp files for nodes (including shx, dbf files). 2) ESRI shp files for lines (including shx, dbf files).
Further files (optional): 1) ASCII text file for turn time penalties and prohibited turns. 2) Cube PuT line file (*.lin) in ASCII format (+ve node numbers mark stop points, where boarding and alighting is permitted).