Intermittently getting Strange, Pixelated Alien, icon when RDP connecting to Domain Controller Server

Question

Hi,

When RDP connecting to one of our Domain Controllers, we are sometimes getting an icon which looks like a pixelated Alien / Face.

Whilst this is intermittent, it seems to happen only when the server has been rebooted and this is the first time a user is logging in. After login, for a split second the icon will show up. This is the icon which is showing up;
https://filestore.community.support.microsoft.com/api/images/0b10e9e5-5789-4f95-bf72-a7a3e0e03696?upload=true

I have found some similar posts, such as the below, however there doesn't seem to be any definitive answers on the cause.

• https://community.spiceworks.com/topic/2003633-blue-screen-black-robot-when-rdp-ing-to-remote-windows-10-pc
• https://www.reddit.com/r/sysadmin/comments/gbk1ze/am_i_losing_my_mind/

From what I've read, it's looking like it may be some kind of visual glitch caused by RDP cache or some kind of bug rather than anything malicious. (Have also done thorough scans + checked relevant logs.)

For info:

• Domain Controller
• Server 2016 Standard

Has anyone had similar and can confirm the cause? Thank you.