Versions

6.3.9431.0 (winmain_bluemp.130615-1214)	2.00%
6.2.9200.16384 (win8_rtm.120725-1247)	94.00%
6.2.9200.16384 (win8_rtm.120725-1247)	4.00%

This is a Windows system installed file with Windows File Protection (WFP) enabled.

wshost.exe has 3 known versions, the most recent one is 6.3.9431.0 (winmain_bluemp.130615-1214). wshost.exe is run as a standard windows process with the logged in user's account privileges. The average file size is about 25.47 KB. It is an authenticode code-signed executable issued to Microsoft Corporation by the certification authority Microsoft Corporation. This is a .NET Common Language Runtime (CLR) assembly. During the process's lifecycle, the typical CPU resource utilization is about 0.0026% including both foreground and background operations, the average private memory consumption is about 4.44 MB with the maximum memory reaching around 14.29 MB. Addionally, typically read and write I/O disk operations is about 3.9 KB per minute for reads and 2.75 KB per minute for writes.

The wshost.exe process goes by the name COM Surrogate and the only time you're likely even to notice its existence is when it crashes and you get the message COM Surrogate has stopped working. The COM Surrogate is a sacrificial process for a COM object that is run outside of the process that requested it. It does this in case the process it is trying to run crashes and instead of crashing the calling process the COM Surrogate crashes instead and the calling program is uneffected.