filecoauth.exe
Sources: 300M+ executions observed in the wild.
Summary
Microsoft Office File Co-Authoring process handles real-time co-authoring functionality for Office documents stored in OneDrive or SharePoint.
filecoauth.exe is the 45th most commonly executed Windows program in EchoTrail's dataset, observed 842,563 times across enterprise environments. It typically runs from C:\Users\... and it is most often launched by svchost.exe.
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Behavior
Top Paths
- C:\Users\...96.9%
- C:\Program Files\Microsoft OneDrive\21.230.1107.00040.6%
- C:\Program Files\Microsoft OneDrive\21.220.1024.00050.4%
- C:\Program Files\Microsoft OneDrive\21.205.1003.00050.12%
- C:\Program Files (x86)\Microsoft OneDrive\21.030.0211.00020.11%
- C:\Program Files\Microsoft OneDrive\21.150.0725.00010.1%
- C:\Program Files\Microsoft OneDrive\21.180.0905.00070.1%
- C:\Program Files\Microsoft OneDrive\21.205.1003.00030.09%
- C:\Program Files (x86)\Microsoft OneDrive\21.099.0516.00030.09%
- C:\Program Files (x86)\Microsoft OneDrive\21.052.0314.00010.08%
Top Hashes (SHA256)
- 247a2a6d32258e47c3d126afd62826657a003e3a59b0d0d4668e08756ffc9aa76.01%
- 6e815f97f15b9bde2ae076de61a408815d4e7e27179288e645f773147c85b3aa3.6%
- 65fa9ea7161aeca034301cad4a237a939f95561cc41ef5e2388645ff9ccfb65c3.58%
- 618c48236a2ab1bde332751ce05d666d29815399ab9a26c1dea575c08caa55063.21%
- ee680a746843f6c0d72c18fc4fd96a8408fae6bce0d1b9ffc864e4cae7a833ba3.21%
- c8d3bca1cfa293377e98c5d4d01a9f1af738100f38a1d8c8a40e326fd99cfb562.41%
- 600683fb8115f433efaadf70dbe283dba4cc1a9276a47f35b17da4244c63fb592.2%
- a7361f6813f0cd4f41a59427c916410bb6fa99002fb294bcc73202ba4999bf941.99%
- baf262a983c4620ba143ea527895f2ef1137f462ea3b296d69bd30ac084fccc01.88%
- add2c9fbcaf1bb19f4717230a78cb7bc98f70e79df5076835fdc6ed0a8e748b01.82%
Process Ancestry
Top Grandparents
- services.exe99.96%
- explorer.exe0.03%
- OpenWith.exe<0.01%
Top Parents
- svchost.exe100%
- ONENOTE.EXE<0.01%
- EXCEL.EXE<0.01%
Top Children
- chrome.exe50%
- conhost.exe16.67%
- WerFault.exe6.67%
- cmd.exe3.33%
- crashpad_handler.exe3.33%
Security Analysis
What does filecoauth.exe normally do?
Located in C:\Windows\System32 or standard Windows/Office paths. Part of normal Windows or Office operations.
When is filecoauth.exe suspicious?
Running from non-standard paths. Parent process other than expected. Spawning shells or unusual child processes.
How do attackers abuse filecoauth.exe?
Not commonly abused.
Detection guidance
Low priority. Validate path and parent process.
False positive notes
Normal system/Office operation.
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