7:00 AM
Paul B
The alerts I was seeing were WinEvtLog: Security: AUDIT_FAILURE(4625) coming from our host based intrusion detection monitor. Our log monitor was also sending alerts saying Microsoft-Windows-Security-Auditing: An account failed to log on. Subject: Security ID: S-1-0-0 Account Name: - Account Domain: - Logon ID: 0x0 Logon Type: 3 Account For Which Logon Failed: Security ID: S-1-0-0. All of the alerts listed my computer's host name as the account that was failing the audit!
Well, it turns out that by default Windows Defender wants to scan network files and network file shares. That's honestly pretty annoying since we have antivirus on those servers already, and I don't need Windows Defender to scan anything except what's on my local machine. It's also annoying because it kicked off all of the alerts!
Well, to disable network scanning is fairly simple. You just need to open powershell as an administrator and run the following:
- set-mppreference -DisableScanningNetworkFiles 1
- set-mppreference -DisableScanningMappedNetworkDrivesForFullScan 1
To see what settings you have enabled or disabled you can run the following from powershell to get a list:
- get-mppreference
Did you find this helpful? Let us know in the comments!
