*C# Dropper: Attack Chain Fully Executed + Detailed Blue Perspective of the Attack Timeline (MDE BlockMode Auto Investigations)* We got the dropper almost there with only one detection on the UAC bypass which MDE wrongly classified as blocked. This itself was a bit of a battle as MDE completely blocks the stock UAC bypass from executing. The incident starts with the dropper assessing the executing process’s SID and escalating if not Administrator, dropping files to disk via ngrok (https), injecting shellcode for the first C2 callback in high integrity and then installing WMI persistence with ProcessStartTrace on WinStore.app.exe, which injects shellcode and calls back to the C2 as SYSTEM, every time the Windows store is launched. We modified and utilized the commoditized tooling found below (unmodified versions).
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