Silent Scanning – Compromise Assessment with THOR Lite on a Compromised Exchange 2019 Server

by Florian Roth | Sep 1, 2021

The following video shows a compromise assessment with our free THOR Lite scanner on a Microsoft Exchange 2019 server detecting ProxyShell and ProxyToken exploitation.

We’ve done no post-editing in this video. You can jump to all findings using the video chapters. You’ll see log entries, web shells and a modified IIS server configuration as reported by HuntressLabs in various reports. We added some Synth-wave tracks to create the right atmosphere. Enjoy.

By the way, we compiled a blog article regarding compromise assessments of Exchange servers with THOR Lite to detect ProxyLogon exploitation with some recommendations that still apply. You can find that blog post here.

About the author:

Florian Roth

Florian Roth serves as the Head of Research and Development at Nextron Systems. With a background in IT security since 2000, he has delved deep into nation-state cyber attacks since 2012. Florian has developed the THOR Scanner and actively engages with the community via his Twitter handle @cyb3rops. He has contributed to open-source projects, including 'Sigma', a generic SIEM rule format, and 'LOKI', an open-source scanner. Additionally, he has shared valuable resources like a mapping of APT groups and operations and an Antivirus Event Analysis Cheat Sheet.