Versions

3.2.9600.17029 (winblue_gdr.140219-1702)	4.00%
3.1.9600.16384 (winblue_rtm.130821-1623)	4.00%
2.0.9200.16384 (win8_rtm.120725-1247)	76.00%
2.0.9200.16384 (win8_rtm.120725-1247)	8.00%
2.0.8400.0 (winmain_win8rc.120518-1423)	4.00%
2.0.8400.0 (winmain_win8rc.120518-1423)	4.00%

There are 6 versions of fussvc.exe in the wild, the latest version being 3.2.9600.17029 (winblue_gdr.140219-1702). It is started as a Windows Service called 'fussvc'. In addition, it is run under the context of the SYSTEM account with extensive privileges (the administrator accounts have the same privileges). The average file size is about 135.33 KB. Some variations of the file have been seen to be installed with the program Windows App Certification Kit Native Components from Microsoft Corporation. During the process's lifecycle, the typical CPU resource utilization is about 0.0000% including both foreground and background operations, the average private memory consumption is about 1008 KB with the maximum memory reaching around 3.73 MB and write I/O transfers are about 0 Bytes per minute.

Fast user switching is a feature on some modern multi-user operating systems such as Windows. It allows users to switch between user accounts on a single PC without quitting applications and logging out. Fast user switching in Windows is based on Remote Desktop Services technology.