Windows 10 TH2 Enterprise and Virus Scan Engine (VSAPI) 9.850.1008 compatibility problems in WFBS-SVC 5.8

- Updated:
- 13 Mar 2020
- Product/Version:
- Worry-Free Business Security Services
- Worry-Free Business Security Services 5.8
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Summary

Microsoft has just released a Windows 10 TH2 Enterprise version. The Worry-Free Business Security Services (WFBS-SVC) team is working on compatibility testing with WFBS-SVC agent b.1071. The following issues have been identified:

Blue Screen of Death (BSOD) occurs on Windows 10 when the Driver Verifier is enabled with VSAPI 9.850.1008.
Core tech modules stop when Device Guard is enabled

Device Guard is a new feature introduced (and only available) in the Windows 10 TH2 Enterprise x64 edition.

Details

Testing results show that the compatibility issues above occur in Windows 10 TH2 Enterprise x64 platforms under the following scenarios:

The BSOD is caused when the Driver Verifier feature is enabled while the Code Integrity Checks option is on.
The Device Guard is turned off by default. When it is turned on, the following modules stop:
- Virus Scan Engine (VSAPI)
- Network Monitoring Driver (tmusa.sys)
- Firewall Driver (tmwfp.sys)
- Early Boot Cleanup Driver (tmebc64.sys)

Enabling Driver Verifier

To enable Driver Verifier:

Open the Command Prompt as Administrator.
Type “verifier”.
Under Select a task, choose Create custom settings (for code developers).
Click Next.
Tick the checkbox for Code integrity checks.
Click Next.
Choose Select driver names from a list.
Click Next.
Tick the checkbox for vsapint.sys.
Click Finish. The BSOD will happen after reboot.

Enabling Device Guard

To enable Device Guard:

Enable the Unified Extensible Firmware Interface (UEFI) in the basic input/output system (BIOS). For example, in DELL BIOS:
Settings > Secure Boot > Secure Boot Enable
Go to System Drive > Windows > System32.
Run gpedit.msc with administrator privilege to edit the Local Group Policy.
Go to Computer Configuration > Administrative Templates > System > Device Guard.
Click Turn On Virtualization Based Security. A detailed configuration dialog will appear.
Choose Enabled.
Select Enable Virtualization Based Protection of Code Integrity.
Reboot to apply the changes.

As a temporary workaround, please turn off Device Verifier and Device Guard.

The WFBS-SVC team will finish compatibility testing on January 16, 2016. They will also release a hot fix to address the compatibility issues, but ETA is not available yet.