How to enable automatic update on Defender Antivirus


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jimhow4545

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I had to manually clicked Check for updates and Security Intelligence Updates is downloaded.
 

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MS Defender typically updates automatically once a day. You may change this interval via Group Policy or PowerShell command. The second command below will display Defender's current configuration.
Powershell: 
Set-MpPreference -SignatureUpdateInterval (1-24)

Get-MpPreference
 

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oldschool said:
MS Defender typically updates automatically once a day. You may change this interval via Group Policy or PowerShell command. The second command below will display Defender's current configuration.
Powershell: 
Set-MpPreference -SignatureUpdateInterval (1-24)

Get-MpPreference
Click to expand...
I don’t know where to look for in here:
 

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jimhow4545 said:
I don’t know where to look for in here:
Click to expand...
Look for SignatureUpdateInterval. Unless you've previously made changes via Group Policy or with PowerShell, or with some 3rd party app, what the Get-MpPreference command will show you are all the default settings. If you run the 1st command I posted with your chosen value, and then run the 2nd, you'll see -SignatureUpdateInterval shows your new value.
 

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It is possible that your PC is infected, you might want to check with additional anti-malware scanners.

www.lifewire.com

14 Free On-Demand Virus Scanners

This is a list of free virus scanners for your computer. Standalone antivirus tools like these are great in particular situations, and some are even entirely portable.
www.lifewire.com www.lifewire.com
 

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The update interval is set to 0. That may indicate the presence of another security product.

You can check what's running with the following Powershell command
If there is another product listed other than Windows Defender and the product properly registeres with WSC (most of them do) then Windows Defender will disable itself
Powershell: 
Get-CimInstance -Namespace root\SecurityCenter2 -class AntiVirusProduct
 

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neemobeer said:
The update interval is set to 0. That may indicate the presence of another security product.

You can check what's running with the following Powershell command
If there is another product listed other than Windows Defender and the product properly registeres with WSC (most of them do) then Windows Defender will disable itself
Powershell: 
Get-CimInstance -Namespace root\SecurityCenter2 -class AntiVirusProduct
Click to expand...
here
 

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so SignatureUpdateInterval should be 1 instead 0?
 

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Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offl...2 Intel Xeon 5680120 GbMSI(Nvidia) GeForce GTX 970
OS
Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offline)
Computer type
PC/Desktop
Manufacturer/Model
DELL T7500
CPU
2 Intel Xeon 5680
Memory
120 Gb
Graphics Card(s)
MSI(Nvidia) GeForce GTX 970
Monitor(s) Displays
Dell S2719DGF
Screen Resolution
2560 x 1440 (155Hz)
Hard Drives
Samsung 2TB 870 (24H2 Device)
Samsung 1TB 860 (23H2 Beta)
PSU
Dell 1100W
Antivirus
Premium Malwarebyte, AdwCleaner (Malwarebyte)
Well actually it looks like your system is scheduled to check for updates on the 8th of each month at 1:45am

Nevermind 8 means never check.

From an elevated Powershell prompt
Powershell: 
Set-MpPreference -SignatureScheduleDay 0

That should enable signature checking
 

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neemobeer said:
Well actually it looks like your system is scheduled to check for updates on the 8th of each month at 1:45am

Nevermind 8 means never check.

From an elevated Powershell prompt
Powershell: 
Set-MpPreference -SignatureScheduleDay 0

That should enable signature checking
Click to expand...
ok
 

My Computer My Computer

At a glance

Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offl...2 Intel Xeon 5680120 GbMSI(Nvidia) GeForce GTX 970
OS
Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offline)
Computer type
PC/Desktop
Manufacturer/Model
DELL T7500
CPU
2 Intel Xeon 5680
Memory
120 Gb
Graphics Card(s)
MSI(Nvidia) GeForce GTX 970
Monitor(s) Displays
Dell S2719DGF
Screen Resolution
2560 x 1440 (155Hz)
Hard Drives
Samsung 2TB 870 (24H2 Device)
Samsung 1TB 860 (23H2 Beta)
PSU
Dell 1100W
Antivirus
Premium Malwarebyte, AdwCleaner (Malwarebyte)
neemobeer said:
The update interval is set to 0. That may indicate the presence of another security product.
Click to expand...
jimhow4545 said:
so SignatureUpdateInterval should be 1 instead 0?
Click to expand...
No. 0 means that it is set to default, which is once every 24 hours. If you want it at 4 hour intervals, enter 4, for example.
 

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Windows 11 Pro 25H2 26200.7840Intel Core i3-8145U16GB
OS
Windows 11 Pro 25H2 26200.7840
Computer type
Laptop
Manufacturer/Model
Lenovo IdeaPad L340
CPU
Intel Core i3-8145U
Memory
16GB
Hard Drives
500 GB M2 1 TB HDD
Internet Speed
400 MB
Browser
Chrome | Edge
Antivirus
Microsoft Defender | Block unknown executables | Various ASR rules enabled | Smart App Control
neemobeer said:
Well actually it looks like your system is scheduled to check for updates on the 8th of each month at 1:45am

Nevermind 8 means never check.

From an elevated Powershell prompt
Powershell: 
Set-MpPreference -SignatureScheduleDay 0

That should enable signature checking
Click to expand...
What exactly SignatureScheduleDay do?
 

My Computer My Computer

At a glance

Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offl...2 Intel Xeon 5680120 GbMSI(Nvidia) GeForce GTX 970
OS
Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offline)
Computer type
PC/Desktop
Manufacturer/Model
DELL T7500
CPU
2 Intel Xeon 5680
Memory
120 Gb
Graphics Card(s)
MSI(Nvidia) GeForce GTX 970
Monitor(s) Displays
Dell S2719DGF
Screen Resolution
2560 x 1440 (155Hz)
Hard Drives
Samsung 2TB 870 (24H2 Device)
Samsung 1TB 860 (23H2 Beta)
PSU
Dell 1100W
Antivirus
Premium Malwarebyte, AdwCleaner (Malwarebyte)
oldschool said:
No. 0 means that it is set to default, which is once every 24 hours. If you want it at 4 hour intervals, enter 4, for example.
Click to expand...
Got it
 

My Computer My Computer

At a glance

Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offl...2 Intel Xeon 5680120 GbMSI(Nvidia) GeForce GTX 970
OS
Wind 11 Pro 24H2 (Dev Channel)/23H2Beta (offline)
Computer type
PC/Desktop
Manufacturer/Model
DELL T7500
CPU
2 Intel Xeon 5680
Memory
120 Gb
Graphics Card(s)
MSI(Nvidia) GeForce GTX 970
Monitor(s) Displays
Dell S2719DGF
Screen Resolution
2560 x 1440 (155Hz)
Hard Drives
Samsung 2TB 870 (24H2 Device)
Samsung 1TB 860 (23H2 Beta)
PSU
Dell 1100W
Antivirus
Premium Malwarebyte, AdwCleaner (Malwarebyte)
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