*Custom Dropper Using ngrok to Expose Victim Filesystem over HTTPS* Without leveraging a high integrity context, the dropper is able to download ngrok (SmartScreen normally flags this binary) and executes it in a way that makes the file system, where it was executed, available publicly through an HTTPS tunnel. We used a VBS script to kick off the dropper, making it execute the .cmd file without an output window. GotIt.txt was just simulated data to be exfiltrated but this dropper will be paired with a trending LSA dump technique, in the coming days. Testing was against Microsoft Defender for Endpoint (BlockMode + Automated Investigations) - zero detections. Advanced adversaries such as APT33, APT34 and APT 39 (sub-group of APT34) use ngrok quite skillfully, in order to meet various objectives.
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