Dr.-Ing. Apostolis Zarras

  • Former Assistant - Chair Systems Security
Zarras, Apostolis


I am a PhD candidate in the Department of Electrical Engineering and Information Technology at Ruhr-University Bochum, Germany. I work in the Chair for Systems Security, advised by Professor Thorsten Holz. Before being here, I studied Computer Science at University of Crete, in Greece, where I received my Bachelor degree in 2008 and my Master's degree in 2011. Prior to joining Ruhr-University Bo­chum, I was a research assistant in the Distributed Computing Systems Laboratory at ICS-FORTH.


  • Botnet Detection
  • Underground Economy
  • Web Security


  • MoBE: Detecting Modern Bot­nets
  • WOMBAT: Worldwide Observatory of Malicious Behaviors and Attack Threats


Neuralyzer: Flexible Expiration Times for the Revocation of Online Data

Apostolis Zarras, Katharina Kohls, Markus Dürmuth, Christina Pöpper - In Proceedings of the ACM Conference on Data and Application Security and Privacy (ACM CODASPY) 2016 *** OUTSTANDING PAPER AWARD ***

Revealing the Relationship Network Behind Link Spam

Apostolis Zarras, Antonis Papadogiannakis, Sotiris Ioannidis, Thorsten Holz - 13th Annual Conference on Privacy, Security and Trust (PST), Izmir, Turkey, July 2015

The Dark Alleys of Madison Avenue: Understanding Malicious Advertisements

Apostolis Zarras, Alexandros Kapravelos, Gianluca Stringhini, Thorsten Holz, Christopher Kruegel, Giovanni Vigna - 14th ACM SIGCOMM Internet Measurement Conference (IMC), Vancouver, Canada, November 2014

The Art of False Alarms in the Game of Deception: Leveraging Fake Honeypots for Enhanced Security

Apostolis Zarras - 48th IEEE International Carnahan Conference on Security Technology (ICCST), Rome, Italy, October 2014

Automated Generation of Models for Fast and Precise Detection of HTTP-Based Malware

Apostolis Zarras, Antonis Papadogiannakis, Robert Gawlik, Thorsten Holz - 12th Annual Conference on Privacy, Security and Trust (PST), Toronto, Canada, July 2014

k-subscription: Privacy-Preserving Microblogging Browsing through Obfuscation

Panagiotis Papadopoulos, Antonis Papadogiannakis, Michalis Polychronakis, Apostolis Zarras, Thorsten Holz, Evangelos P. Markatos - 29th Annual Computer Security Applications Conference (ACSAC), New Orleans, USA, December 2013

B@bel: Leveraging Email Delivery for Spam Mitigation

Gianluca Stringhini, Manuel Egele, Apostolis Zarras, Thorsten Holz, Christopher Kruegel, Giovanni Vigna - 21st USENIX Security Symposium, Bellevue, WA, USA, August 2012

Understanding Fraudulent Activities in Online Ad Exchanges

Brett Stone-Gross, Ryan Stevens, Apostolis Zarras, Richard Kemmerer, Christopher Kruegel, Giovanni Vigna - 11th ACM SIGCOMM Internet Measurement Conference (IMC), Berlin, Germany, November 2011