Windows 10: AM Delta Patch downloading from External IP Verizon?

I came across one of our assets downloading something from below. I was highly suspicious of this initially.hxxp[://]151[.]205[.]24[.]71/data/011b83b7a121ab1a/9[.]au[.]download[.]windowsupdate[.]com/d/msdownload/update/software/defu/2022/07/am_delta_patch_1[.]371[.]455[.]0_af484f50cb49b7fd2a127f9cc0496d3f9393ffb3[.]exeThe IP resolves to Verizon and upon checking what the am delta patch is, it appears to be related to MS Security essentials check from reading the post below:https://answers.microsoft.com/en-us/protect/forum/mse-protect_start/am-delta-patch-mpcmdrunexe/da6630bc-07f7-4573-9a00-a53

:)

 

Delta size too big when creating patches

I'm using WiX to create installers and patches for an application. We previously used a bdiff-based method to create patches, and are able to get comparable results in
WiX which uses Delta patching (specifically mspatchc.dll) (Delta Compression Application Programming Interfaces | Microsoft Docs)

However one particular file has deltas much larger than expected - from an original 100MB file, bdiff will create a
15KB patch, while Delta returns an 18MB patch.

I've raised the issue on the WiX-users mailing list, and feedback from there suggests that the issue might be in Delta itself. Is there anything I can try to reduce the patch size myself, or is this something that needs fixing?

 

Delta size too big when creating patches

Thanks, I wasn't sure of the best place. I'll repost on msdn.

For reference, i've reposted here:
https://social.msdn.microsoft.com/Forums/en-US/933436bd-f527-43e9-bc24-94081206a5fb/delta-size-too-big-when-creating-patches?forum=windowssdk

 

Delta UUP

In the face of the problem of new downloads 15048, 15055 has appeared the concept of Delta UUP, which is a set of files of Windows.old / windows / softwareDistribution / download. To this set a descryter is applied and the corresponding ISO is also obtained. I am explaining what is being done on other websites.
Steps.
1.- Get Delta UUP
2.- Apply the corresponding descryptor: in my case uup-converter-wimlib-5
* All this can be seen for example in Mydigitallife forum.