18 June 2018

We developed a data-driven method for identifying, quantifying, and comparing ransom payments in the Bitcoin ecosystem from 35 ransomware families. The study was conducted in partnership with Bernhard Haslhofer from the Austrian Institute of Technology (AIT) and Benoît Dupont from the Université de Montréal (UdeM). It resulted in a paper that will be presented at the 17th Annual Workshop on the Economics of Information Security (WEIS2018) in Innsbruck, Austria, along other renown academic researchers. This blog post provides a quick summary of the methodology developed for tracing ransomware payments and the study's findings. 

May 26, 2016

In this article, we will be looking at the strategies to detect and analyze malware hidden inside an OPcache file. If you haven't read our previous article about hiding a binary webshell inside a PHP7 OPcache file, we suggest reading it before moving on.

May 04, 2016

In 2015, Alexey Tyurin from ERPScan presented at the Hack-In-The-Box Amsterdam conference [2][3] multiple attack vectors to defeat the widely used Oracle PeopleSoft (or PS) system. Many companies in various market verticals are relying on this massive and complex software to host confidential information about their employees, their students or even about the financial results of the company. Furthermore, many corporations are exposing this platform on the Internet, especially when relying on PS for career portals or student portals. A year later, I am still amazed to see publicly accessible systems or internal PeopleSoft deployments during our intrusion testing practice that are vulnerable to these common attack vectors. These deployments fail to deliver a useful result, putting the entire company workforce identity at risk. The following post will explain how to attack the PS_TOKEN, as well as describe our contributions to John the Ripper and oclHashcat in order to speed up the cracking process.

April 27, 2016

In this article, we will be looking at a new exploitation technique using the default OPcache engine from PHP 7.  Using this attack vector, we can bypass certain hardening techniques that disallow the file write access in the web directory. This could be used by an attacker to execute his own malicious code in a hardened environment.