filecoauth.exe
Sources: 300M+ executions observed in the wild and observed in the EchoTrail lab on Windows 11.
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%
- C:\Users\lab\AppData\Local\Microsoft\OneDrive\26.168.0830.0006
Top Hashes (SHA256)
- 247a2a6d32258e47c3d126afd62826657a003e3a59b0d0d4668e08756ffc9aa76.01%
- 6e815f97f15b9bde2ae076de61a408815d4e7e27179288e645f773147c85b3aa3.6%
- 65fa9ea7161aeca034301cad4a237a939f95561cc41ef5e2388645ff9ccfb65c3.58%
- 618c48236a2ab1bde332751ce05d666d29815399ab9a26c1dea575c08caa55063.21%
- ee680a746843f6c0d72c18fc4fd96a8408fae6bce0d1b9ffc864e4cae7a833ba3.21%
- c8d3bca1cfa293377e98c5d4d01a9f1af738100f38a1d8c8a40e326fd99cfb562.41%
- 600683fb8115f433efaadf70dbe283dba4cc1a9276a47f35b17da4244c63fb592.2%
- a7361f6813f0cd4f41a59427c916410bb6fa99002fb294bcc73202ba4999bf941.99%
- baf262a983c4620ba143ea527895f2ef1137f462ea3b296d69bd30ac084fccc01.88%
- add2c9fbcaf1bb19f4717230a78cb7bc98f70e79df5076835fdc6ed0a8e748b01.82%
- bdb3127a6fe35988b2f13196230938d3412c27f9f2be2a23caab1b000021532f
Code Signing
Signers by share of executions
- 100%Microsoft CorporationValidEmbedded signature · 2 hashes
- Chain
- Microsoft Corporation
- Microsoft Windows Code Signing PCA 2024
- Microsoft Root Certificate Authority 2010
- Valid
- Mar 5, 2026 to Mar 3, 2027
- Hashes
- bdb3127a6fe35988b2f13196230938d3412c27f9f2be2a23caab1b000021532f68.29% of executions, first seen Sep 24, 2026
- a072a00aa3ed1f5bf57cb57b4f76a163e0e7bc19e6d3534cc15835d16122d0af31.71% of executions, first seen Sep 11, 2026
Full certificate detail on Team.
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
- mscorsvw.exe80%
- chrome.exe7.14%
- conhost.exe5.24%
- GoogleDriveFS.exe2.86%
- WerFault.exe1.43%
- cmd.exe0.48%
- crashpad_handler.exe0.48%
- pcaui.exe0.48%
Lab record
- Installed from
- winget SUPERAntiSpyware.SUPERAntiSpyware 10.0.1278
- Publisher
- Microsoft Corporation
- Persistence
- none
- Network
- none
- Command lines
- 1 pattern (10 launches)
- DLL loads
- 72 patterns (858 loads)
- Registry writes
- 3 patterns (30 writes)
- File writes
- 7 patterns (40 writes)
- HTTP requests
- 0 patterns (0 requests)
- TLS connections
- 0 patterns (0 handshakes)
- Named pipes
- 0 patterns (0 events)
- Process access
- 0 patterns (0 events)
- Driver loads
- 0 patterns (0 loads)
- PowerShell blocks
- 0 patterns (0 blocks)
- Remote threads
- 0 patterns (0 events)
- Audit events
- 1 pattern (10 events)
Full record on Team.
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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