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Check the complete path, signature, SHA-256 hash and an antivirus result before deciding what to do. If Office is reporting an error, repair or reinstall Office from Microsoft or your organization’s software source rather than downloading a replacement EXE.
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What OsfInstallerBgt.exe is known to be
OsfInstallerBgt.exe is commonly listed among Microsoft Office files. An inventory of Microsoft Project Professional 2019 recorded a file of approximately 31.84 KB at:
C:Program FilesMicrosoft OfficerootvfsProgramFilesCommonX64Microsoft SharedOFFICE16OsfInstallerBgt.exe
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The same inventory showed related files named OsfInstaller.exe, osfbgt.dll and OsfInstallerConfig.xml. That association makes a copy in the shared OFFICE16 directory plausible. It does not authenticate a particular file, because a malicious program can be given a familiar name and placed somewhere else.
No Microsoft-authored description establishes the executable’s exact internal function, and no canonical Microsoft hash for this filename is available. Treat descriptions that assign a very specific job to the process as unverified unless they are supported by the file’s own documentation or by your organization’s Office deployment records.
Is OsfInstallerBgt.exe safe?
Safety depends on the individual copy, not on the spelling of the name. Use all of the following evidence together:
| Check | Reassuring result | Warning sign | What to do |
|---|---|---|---|
| Location | The file is inside the Microsoft Office shared OFFICE16 path shown above, or another path documented by your Office administrator. |
It is in Downloads, a temporary folder, a user profile, an email attachment folder or an unrelated application directory. | Do not run an unexpected copy. Continue with signature and malware checks. |
| Digital signature | Properties shows a valid Microsoft signature and an intact certificate chain. | The signature is missing, invalid, expired without a valid chain, or belongs to an unrelated publisher. | Quarantine the file with security software and ask your security team to examine it. |
| Hash | Your organization can match the SHA-256 value to a known-good Office package. | The hash is unknown or differs from the approved package. | Do not replace or launch the file merely because its name looks right. |
| Security scan | Windows Security and any additional approved scanner report no detection. | A scanner identifies malware or a potentially unwanted program. | Follow the scanner’s quarantine and remediation workflow. |
| Provenance | The file arrived as part of Office installed from Microsoft or a managed company source. | It came from an unknown website, unsolicited installer or cracked software bundle. | Keep it isolated and investigate before opening it. |
A valid signature is strong evidence that the file was signed by the named publisher and has not been altered since signing, but it is not a substitute for checking where the file came from. Conversely, an unsigned file is not automatically malware; it is a reason to require more evidence before trusting it.
How to verify your copy step by step
-
Find the actual file
If the process is running, press
Ctrl+Shift+Escto open Task Manager. On the Processes or Details tab, locateOsfInstallerBgt.exe, right-click it and choose Open file location. If it is not running, search for the filename in File Explorer, then use Open file location from the search result’s context menu.Do not rely on a shortened path shown in a process list. In File Explorer, click the address bar and copy the complete directory. Compare it with the Office shared path above. A path that merely contains the words “Microsoft” or “Office” is not enough.
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Check the file details
Right-click the file, choose Properties, and review the General and Details tabs. Note the size, creation and modification dates, product name, file description and original filename. A 31.84 KB size is an approximate value reported for one Project Professional 2019 inventory, not a universal specification; updates and editions can differ.
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Validate the digital signature
In Properties, open Digital Signatures, select the listed signature and choose Details. Windows should report that the digital signature is valid. Open the certificate information and confirm that the signer is Microsoft and that Windows can build a valid certificate chain. If the tab is absent, the signature is invalid, or the signer is unrelated, do not treat the file as an Office component until it has been investigated.
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Scan with Windows Security
Right-click the file in File Explorer and select Scan with Microsoft Defender or Scan with Windows Security, depending on the label in your Windows edition. You can also open Windows Security > Virus & threat protection > Scan options and choose a targeted or full scan. Let the scan complete before allowing the process to run again.
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Record a SHA-256 hash
Open PowerShell and run this command, replacing the path with the location you recorded:
Get-FileHash -Algorithm SHA256 -Path 'C:Program FilesMicrosoft OfficerootvfsProgramFilesCommonX64Microsoft SharedOFFICE16OsfInstallerBgt.exe'Save the resulting hash with the file path, signature status and scan result. Submit it to your organization’s security team or a reputable multi-engine scanner according to your security policy. There is no published Microsoft canonical hash in the available documentation against which every copy can be compared.
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Check how the file arrived
If the executable appeared after an Office installation, update or repair from Microsoft or a managed software portal, that history supports legitimacy. If it arrived in a download, an unsolicited installer or an unknown archive, do not open it. Microsoft warns that attackers abuse installer delivery and recommends avoiding applications from unknown websites.
What a malware report means
A YARAify record dated 2026-07-19 concerns a separately uploaded file named 400000.OsfInstallerBgt.exe. ClamAV matched that sample as Win.Malware.Zusy-9953040-0. This is evidence about that uploaded sample only. It does not establish that every OsfInstallerBgt.exe installed with Office is malicious, nor does it tell you that the copy on your computer has the same hash.
When a scanner detects your file, preserve the detection name, path, hash and timestamp. Do not dismiss the alert because the name resembles an Office file, and do not assume that a clean result from one scanner proves safety. Conflicting results should be reviewed by your security team or another trusted multi-engine service.
Symptoms associated with OsfInstallerBgt.exe
High CPU, memory or disk activity
The name alone does not show why a process is busy. First verify its location and signature, then scan it. If the activity began during an Office installation, update or repair, restart Windows and check whether the activity stops. Persistent activity from a copy in a temporary or download directory should be treated as suspicious rather than as a normal Office workload.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems“Application error” or a process that stops unexpectedly
Write down the complete error text, the time it appeared and which Office operation was in progress. A damaged Office installation, missing related component or an untrusted replacement can produce similar symptoms. Do not download a new EXE to test a theory; repair the installation from an official or managed source after checking the file.
“OsfInstallerBgt.exe is missing”
A missing-file message can mean that Office files were removed, quarantined, or left incomplete after an interrupted update. Check Windows Security’s protection history first. If security software removed a confirmed malicious file, follow its remediation instructions. If the file was removed without a malware detection and Office is installed, use Office repair or reinstall instead of copying an EXE from a download site.
The process appears from an unexpected folder
Stop treating it as an Office component until the path, signature, hash and scan are reviewed. Do not launch it, and do not delete it while Office is still installed unless security software has confirmed that it is malicious. Manual deletion of a legitimate shared component can create additional Office repair errors.
Manual fixes for Office-related errors
1. Restart Windows
Save your work and restart the computer. A restart clears a locked installer process and can complete a pending Office update. After signing in, reproduce the original action once and note whether the same message returns.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match2. Repair the Office app in Windows 11
- Open Settings.
- Choose Apps > Installed apps.
- Find the affected Office application or suite.
- Select the three-dot menu, choose Advanced options, and select Repair when it is available.
- Restart Windows and test the Office operation again.
- If the problem remains and Windows offers it, return to the same page and choose Reset. Reset can remove the app’s local data, so record any settings or unsaved templates first.
The labels and available buttons vary by Office edition and deployment method. A Click-to-Run suite, a Microsoft Store package and a company-managed installation may expose different repair controls.
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3. Use the Office change or repair entry on older Windows
On Windows 10, 8 or 7, open Control Panel > Programs and Features, select the Microsoft Office entry and choose Change or Repair if your edition provides it. Follow the wizard, allow it to replace damaged shared components, then restart. If the computer is managed by an employer or school, the repair option may be controlled by the administrator.
4. Uninstall and reinstall when repair fails
Use Windows’ installed-app removal control or the Office maintenance option to uninstall the affected Office product. Restart, then reinstall only from Microsoft or your organization’s managed software source. Sign in with the account or license used by the installation and allow the installer to finish without interrupting it. Reinstallation restores the executable together with related files such as the Office shared components; downloading only OsfInstallerBgt.exe does not.
Microsoft’s Windows install/uninstall troubleshooter can address corrupted registry keys and incomplete install, uninstall or update data. Use it when the normal removal or installation process is blocked, and keep the exact error message for your administrator if the device is managed.
5. Identify MSIX or App Installer deployments
If the message appears during an MSIX or App Installer deployment, open Event Viewer and review the Microsoft-documented MSIX/App Installer troubleshooting logs. This branch applies to that deployment technology; do not assume its log guidance explains a normal Office Click-to-Run installation. First identify whether the failing product is an MSIX package, an App Installer deployment or a conventional Office setup.
6. Do not use an EXE download site as a repair source
Standalone executable download sites cannot restore the related Office files, registry entries, package metadata or signatures that a repair needs. They also make it harder to tell whether a replacement was altered. Use Office repair, uninstall/reinstall, Microsoft’s installer or your organization’s approved software distribution instead.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do when malware is suspected
- Isolate the file. Do not open it or approve an elevation prompt. If Windows Security has detected it, use quarantine or the action it recommends.
- Run Windows Security scans. Start with a targeted scan of the file and then run a full scan if the result or behavior remains concerning.
- Use an offline or second-opinion scan. Microsoft recommends Windows Defender Offline or Microsoft Safety Scanner for comprehensive detection and removal. Follow the current instructions supplied with those tools and save their results.
- Understand the role of the Malicious Software Removal Tool. Microsoft describes MSRT as a post-infection removal tool and says it does not replace full antivirus protection.
- Escalate uncertain cases. Give your security team the path, SHA-256 hash, signature details, detection name and the YARAify/ClamAV comparison only as context. They can decide whether the file should be preserved for analysis or removed.
Microsoft Support says: “If you’re trying to remove malware, you can use Windows Security (or another antivirus tool), or you can use the Windows Malicious Software Removal tool.”
Do not manually delete a file that sits in the Office shared directory merely because an error mentions it. If it is legitimate, deletion can turn a recoverable Office problem into a broader installation failure. Let security software confirm maliciousness, or repair the Office installation so the component is restored correctly.
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A practical decision path
- Expected Office path, valid Microsoft signature, clean scan: treat the file as a likely legitimate Office component and use restart, repair or reinstall for the Office error.
- Expected path but invalid signature or malware detection: isolate it with Windows Security, run the recommended offline or second-opinion scans, and involve your security team before repairing Office.
- Unexpected path, regardless of filename: do not run it. Record the hash, scan the file and investigate its source.
- Office repair does not work: use the official uninstall/reinstall route and, for blocked setup or removal, Microsoft’s install/uninstall troubleshooter.
- MSIX or App Installer error: identify that deployment type and inspect its Event Viewer logs instead of applying Click-to-Run assumptions.
Key points to keep
- OsfInstallerBgt.exe is associated with Microsoft Office shared components, particularly an
OFFICE16directory, but a filename is not proof of authenticity. - The complete path, Microsoft digital signature, SHA-256 hash, scan result and file provenance provide a much stronger safety judgment than name recognition.
- A dated YARAify record shows that one separately uploaded sample received a ClamAV malware match; it does not classify every Office-installed copy.
- Repair or reinstall Office from an official or managed source. Never substitute an EXE downloaded from an unknown site.
- There is no Microsoft-published exact function or canonical hash for this filename in the available documentation, so avoid claims that go beyond what your own file checks establish.
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