Microsoft Exchange Servers are a high-value target for many adversaries, which makes the investigation of them during Incident Response vital. Backdoor implants in the form of webshells and IIS modules on servers are on the rise. Find out how to hunt webshells and differentiate between legitimate use and attacker activity, using default logging available on every exchange server. The presentation will feature real-world examples carried out by an adversary group using web-based backdoors to breach and maintain access to networks of targeted organizations in the Middle East.