mscorsvw.exe
Summary
.NET Framework Optimization Service worker process. It pre-compiles .NET assemblies into native code in the background to improve application startup performance. It is the worker process spawned by ngen.exe to perform the actual compilation work.
mscorsvw.exe is the 16th most commonly executed Windows program in EchoTrail's dataset, observed 4,629,761 times across enterprise environments. It typically runs from C:\Windows\Microsoft.NET\Framework64\v4.0.30319 and it is most often launched by ngen.exe.
Behavior
Top Paths
- C:\Windows\Microsoft.NET\Framework64\v4.0.3031955.26%
- C:\Windows\Microsoft.NET\Framework\v4.0.3031944.74%
- C:\Windows\Microsoft.NET\Framework\v2.0.50727<0.01%
Top Hashes (SHA256)
- 101c3e900ff5f2d29ac49dff4b95281637cf10aa8a19a6c84741bb5019aff29418.89%
- c35cfd9ab9897ce16a6a33bc92d9a49b66c6d9949fd9250acd6bcee4c32c63d815.36%
- 60def9905f16bd5d10684afea17ab3a9accdd8ba4a6e06240e84e3acb5f94e3d7.09%
- da1087ba2641efd77d85e5838aeb6c333e80caa9f24c889fd2de2e0b58f8d1a56.96%
- 097b622bfbc2b6717f0a7d01ffba0aa1a2a1d7e4b298df696250faa164ebc1fb6.29%
- 26175f1c85658ba787741fa7c7b297d105b985742e640201cb38fd6b3c17f0385.35%
- 70de04ea3453256d5153f19681d56d2f59bfd9a1ee01a6d1340e8ac5dfca20c84.98%
- 393729c6f0e4d018039fc0c81c6b3740d43224b2f5889c2d3376c94ef09985744.39%
- 3e5099f573601926e59862fba2495974688e72677c73f10e4c99e26a76cdcf374.33%
- ab17fe71cb14e54dbdd64d6a3a96ab7a84b4f2024aeeac3614659022c2bce0303.65%
Process Ancestry
Top Grandparents
- ngentask.exe96.6%
- services.exe2.73%
- msiexec.exe0.33%
- TiWorker.exe0.15%
- cmd.exe0.1%
- wininit.exe0.03%
- PerfWatson2.exe<0.01%
- setup.exe<0.01%
- svchost.exe<0.01%
Top Parents
- ngen.exe97.44%
- mscorsvw.exe2.52%
- services.exe0.03%
- filecoauth.exe<0.01%
- backgroundTaskHost.exe<0.01%
- svchost.exe<0.01%
- conhost.exe<0.01%
- iCUE.exe<0.01%
- smartscreen.exe<0.01%
- dxgiadaptercache.exe<0.01%
Top Children
- mscorsvw.exe99.97%
- conhost.exe0.02%
- WerFault.exe<0.01%
- ipconfig.exe<0.01%
- MusNotificationUx.exe<0.01%
- netsh.exe<0.01%
- RingCentral Classic.exe<0.01%
- tzutil.exe<0.01%
Rare or environment-specific process names are omitted from ancestry tables. Percentages are of all observed relationships.
Security Analysis
What does mscorsvw.exe normally do?
Located in C:\Windows\Microsoft.NET\Framework64\v4.0.30319 or C:\Windows\Microsoft.NET\Framework\v4.0.30319. Launched by ngen.exe, other mscorsvw.exe instances (worker spawning), or services.exe (when running as a service). High CPU usage during compilation is expected and temporary.
When is mscorsvw.exe suspicious?
Running from a non-.NET Framework path. Launched by unusual parents. Spawning shells or network tools.
How do attackers abuse mscorsvw.exe?
Not commonly abused. Malware could potentially masquerade as mscorsvw.exe to explain high CPU usage.
Detection guidance
Low priority. Validate path is within .NET Framework directories.
False positive notes
High CPU usage is normal and expected — it is compiling .NET assemblies. Bursts of activity after Windows updates or application installations are standard.
Related Processes
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Data from EchoTrail's dataset of ~346M Windows process executions. Last extracted 2026-08-04.