MoUsoCoreWorker.exe
Sources: 300M+ executions observed in the wild.
Summary
Update Session Orchestrator Core Worker manages the orchestration of Windows Update operations, coordinating scanning, downloading, and installing updates.
MoUsoCoreWorker.exe is the 94th most commonly executed Windows program in EchoTrail's dataset, observed 265,728 times across enterprise environments. It typically runs from C:\Windows\System32 and it is most often launched by svchost.exe.
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Behavior
Top Paths
- C:\Windows\System3289.86%
- C:\Windows\UUS\amd649.89%
- C:\Windows\UUS\Packages\Preview\amd640.25%
Top Hashes (SHA256)
- 75c8d712dc7aa2d3f3e9c4590ea6d414deb50f6fedba0cb2f107c82975e2aafb21.71%
- 1dd3a26169f45008f2d0b82f180d52b02ea75615fa9c1f15472e5a2a2845cab916.47%
- d85e486218f7738874aedf296bbf7bc923d6f01936d2a4dfb5932af2bcccadcb15.15%
- db739c886ef4a0852c1510c228aec7a117f258f09469752e8fb3f62a5aac3c855.19%
- 6d17958c6527346036f35c6d9db2f5c8d820cbfbd043588304c7beddf7ea86413.17%
- 22afa24d1a010b9465897bd8657ff34f27efec9ef0aa919eb3f211f1c10269482.32%
- f278e748b6ffdf95038cae2f17f8f99f556b42f22cbf53b6bfc5fea16fc9a46d1.97%
- a250e2af9b662d6a81552178ac7514e81032c5a4b7031666f8e777f597ea5a9d1.89%
- 1958767981f8be7741807d53959f898fc2be2c52cc2aa630ecc855c5b73de7721.86%
- 86bb2dff3f88b2f1ab8dd2c1b6fa3ce78089791d5c446a587ba5f67cd80f70591.69%
Process Ancestry
Top Parents
- svchost.exe99.81%
- conhost.exe<0.01%
Top Children
- UsoClient.exe51.27%
- wuauclt.exe19.05%
- MoNotificationUx.exe16.08%
- OfficeC2RClient.exe13.56%
- WerFault.exe0.03%
- musnotification.exe0.01%
Security Analysis
What does MoUsoCoreWorker.exe normally do?
Located in C:\Windows\System32 or standard Windows/Office paths. Part of normal Windows or Office operations.
When is MoUsoCoreWorker.exe suspicious?
Running from non-standard paths. Parent process other than expected. Spawning shells or unusual child processes.
How do attackers abuse MoUsoCoreWorker.exe?
Not commonly abused.
Detection guidance
Low priority. Validate path and parent process.
False positive notes
Normal system/Office operation.
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