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.
 

My Computer

System One

  • 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)
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
 

My Computer

System One

  • OS
    Windows 11 Pro 23H2
    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
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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My Computer

System One

  • 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)
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.
 

My Computer

System One

  • OS
    Windows 11 Pro 23H2
    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
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
 

My Computer

System One

  • OS
    Windows 11 Home
    Computer type
    PC/Desktop
    CPU
    AMD Ryzen 5 8600G (07/24)
    Motherboard
    ASROCK B650M-HDV/M.2 3.09 (07/24)
    Memory
    2x32GB Kingston FURY DDR5 5600 MHz CL36 @4800 CL40 (07/24)
    Graphics Card(s)
    ASROCK Radeon RX 6600 Challenger D 8G @60FPS (08/24)
    Sound Card
    Creative Sound BlasterX AE-5 Plus (05/24)
    Monitor(s) Displays
    24" Philips 24M1N3200ZS/00 (05/24)
    Screen Resolution
    1920×1080@165Hz via DP1.4
    Hard Drives
    Kingston KC3000 NVMe 2TB (05/24)
    ADATA XPG GAMMIX S11 Pro 512GB (07/19)
    PSU
    Seasonic Core GM 550 Gold (04/24)
    Case
    Fractal Design Define 7 Mini with 3x Noctua NF-P14s/12@555rpm (04/24)
    Cooling
    Noctua NH-U12S with Noctua NF-P12 (04/24)
    Keyboard
    HP Pavilion Wired Keyboard 300 (07/24) + Rabalux 76017 Parker (01/24)
    Mouse
    Logitech M330 Silent Plus (04/23)
    Internet Speed
    500/100 Mbps via RouterOS (05/21) & TCP Optimizer
    Browser
    Edge & Brave for YouTube & LibreWolf for FB
    Antivirus
    NextDNS
    Other Info
    Backup: Hasleo Backup Suite (PreOS)
    Headphones: Sennheiser RS170 (09/10)
    Phone: Samsung Galaxy Xcover 7 (02/24)
    Chair: Huzaro Force 4.4 Grey Mesh (05/24)
    Notifier: Xiaomi Mi Band 9 Milanese (10/24)
    2nd Monitor: AOC G2460VQ6 @75Hz (02/19)
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
 

My Computer

System One

  • OS
    Windows 11
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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My Computer

System One

  • 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)
so SignatureUpdateInterval should be 1 instead 0?
 

My Computer

System One

  • 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
 

My Computer

System One

  • OS
    Windows 11
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

System One

  • 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.
 

My Computer

System One

  • OS
    Windows 11 Pro 23H2
    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
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

System One

  • 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

System One

  • 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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