Dr Nestori Syynimaa

Senior Principal Security Researcher Secureworks


Dr Nestori Syynimaa is one of the leading Azure AD / M365 experts in the world and the developer of the AADInternals toolkit. He has worked with Microsoft cloud services for over a decade and has been MCT since 2013, MVP since 2020, and awarded Microsoft Most Valuable Security Researcher since 2021. Currently, Dr Syynimaa works as a Senior Principal Security Researcher for Secureworks Counter Threat Unit. Before moving to his current position, Dr Syynimaa worked as a CIO, consultant, trainer, researcher, and university lecturer for almost 20 years. 

Dr Syynimaa has spoken in many international scientific and professional conferences, including IEEE TrustCom, Black Hat Arsenal USA & Europe, RSA Conference, DefCon Cloud Village and DefCon Demo Labs.

Abusing Azure AD pass-through authentication vulnerabilities

In May 2022, Secureworks Counter Threat Unit (CTU) researcher found multiple vulnerabilities in one of the Microsoft Azure Active Directory (Azure AD) authentication methods, Pass-through Authentication (PTA). These flaws allow threat actors to gain persistent and undetected access to the target organisation, impersonate users, gather credentials, and perform Denial of Service (DoS) attacks remotely. Microsoft has categorised these vulnerabilities as by-design.

In this talk, we will cover the details of the flaws and show how they can be exploited in action. We will also show how to harden your environment to protect against PTA attacks and detect whether your environment has been compromised.

Are you the next cyber security superstar?

If you are passionate about an information security topic or you have strong technical skills developing researches on your own, you should definitely Apply at Call for Papers. By submitting you will have the chance to showcase your work to +2000 attendees.

Other speakers joining this year

Cosmin Anghel

Cyber Security Director (CISO) SN Nuclearelectrica SA

Giorgi Akhalaia

Associate Professor of ICT, Caucasus University; Scientific Cyber Security Association; Cyber Security Main Specialist at Caucasus Cyber Security Center - Regional Representative of Bit Sentinel Caucasus University

George-Andrei Iosif

Founder Member MutableSecurity

Ready for this year's presentations?

By registering you will unlock access to 60+ speakers and two full days with cyber security news & showcases from worldwide leaders.


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At Orange Business Services, we help our customers transform their industries, reimagine their services, create a positive impact and unleash the power of their data into an amazing and trusted resource.

With the dual expertise as a global operator coupled with the agility of an end-to-end integrator, Orange Business Services is a global network-native, digital services company. From connectivity, smart mobility services and the cloud to artificial intelligence (AI), analytics and cybersecurity, Orange Business Services helps businesses at every stage of their data management. Orange Business Services is represented in Romania by the business division of Orange Romania and helps large companies, SMEs and public authorities to transform their organizations through the use of technology and digital information.


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