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What’s AM_Delta_Patch_1.403.1985.0.exe (Microsoft Antimalware WU Stub)? Is it safe or a virus?

If you have a Windows PC that's online, you're probably noticing that Microsoft Antimalware WU Stub (AM_Delta_Patch_1.403.1985.0.exe) updates on your PC almost every day.

AM_Delta_Patch_1.403.1985.0.exe is a specific executable update for Microsoft Antimalware WU Stub, that appeared around January 11 of 2024. While researching this specific executable in our SpyShelter PC labs, I found Microsoft Antimalware WU Stub Windows Processes with similar "AM_Delta_Patch" .exe names have been appearing on our lab PCs almost every single day. Therefore, I believe it's a safe part of the Windows OS.

Not only is Microsoft Antimalware WU Stub completely safe, but it's an important part of Windows Security that you need to allow to update. Therefore, if you see Microsoft Antimalware WU Stub running in your Task Manager, please leave the process alone.

The only thing you should do is make sure it's actually signed by Microsoft, by checking its Windows Properties, or using our SpyShelter Antispyware app. As long as the Microsoft Antimalware WU Stub is signed and genuine, then it should be safe to run on your PC.

Below are 4 simple steps you can take to see if the AM_Delta_Patch_1.403.1985.0.exe process is safe or malware.

  1. Scan the executable with Microsoft's built-in tech
  2. Find AM_Delta_Patch_1.403.1985.0.exe's publisher
  3. Search the executable's hash with VirusTotal
  4. Monitor the executable's behavior

Researched by Jon @ SpyShelter Labs

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More about AM_Delta_Patch_1.403.1985.0.exe on WINDOWS

Who makes AM_Delta_Patch_1.403.1985.0.exe (Microsoft Antimalware WU Stub)?

We’ve found Microsoft Corporation should be the publisher of AM_Delta_Patch_1.403.1985.0.exe.

How do we know? Our SpyShelter cybersecurity labs focuses on monitoring different types of Windows PC executables and their behaviors for our popular SpyShelter Antispyware software. Learn more about us, and how our cybersecurity team studies Windows PC executables/processes.

What does it mean if someone is the publisher of a PC .exe (executable or process)?

The publisher of an executable is the entity responsible for its distribution and authenticity. Most processes/executables on your PC should be signed. The signature on the executable should have been verified through a third party whose job it is to make sure the entity is who it says it is. Find an unsigned executable? You should consider scanning any completely unsigned .exe on your PC.

Last updated: January 31, 2024

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Why should you trust us?

Our team at SpyShelter has been studying Windows PC executables for over 15 years, to help fight against spyware, malware, and other threats. SpyShelter has been featured in publications like The Register, PC Magazine, and many others. Now we’re working to share free, actionable, and easy to understand information about Windows executables (processes) with the world, to help as many people as possible keep their devices safe. Learn more about us on our "About SpyShelter” page.

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