Nektarios Leontiadis

Research Scientist

I am a Security Engineering Manager on the Integrity, Investigations, and Intelligence team in Washington, D.C. I support a distributed team of highly skilled engineers who work on systems and infrastructure that provide a range of capabilities for Security Investigations.

I joined the company in 2014 as a Threat Research Scientist working on providing a better understanding of the threat ecosystem targeting Facebook users. This understanding involved building and refining signals of compromise, as well as evaluating Facebook’s user remediation systems. I also worked on investigating threats targeting our platform and our users, in an effort to understand the underlying mechanics and economics of the illicit activities.

I hold a PhD in Engineering and Public Policy from Carnegie Mellon University. During my tenure at CMU I worked on empirical measurements and economic modeling of online crime, towards understanding and structuring effective countermeasures. The title of my PhD thesis is Structuring Disincentives for Online Criminals.


Security economics, measurements, online crime, threat intelligence

Latest Publications

USENIX Security - February 22, 2021

SocialHEISTing: Understanding Stolen Facebook Accounts

Jeremiah Onaolapo, Nektarios Leontiadis, Despoina Magka, Gianluca Stringhini

IMC 2018 - October 31, 2018

Following Their Footsteps: Characterizing Account Automation Abuse and Defenses

Louis F. DeKoven, Trevor Pottinger, Stefan Savage, Geoffrey M. Voelker, Nektarios Leontiadis

USENIX 2017 - August 14, 2017

Malicious Browser Extensions at Scale: Bridging the Observability Gap between Web Site and Browser

Louis F. DeKoven, Stefan Savage, Geoffrey M. Voelker, Nektarios Leontiadis

IMC 2017 - November 1, 2017

Measuring and Mitigating OAuth Access Token Abuse by Collusion Networks

Shehroze Farooqi, Fareed Zafar, Nektarios Leontiadis, Zubair Shafq