July 5, 2019

IronPython, darkly: how we uncovered an attack on government entities in Europe


Hunting for new and dangerous cyberthreats is the job of the Positive Technologies Expert Security Center (PT ESC). In early April 2019, PT ESC analysts detected a targeted attack on the Croatian government. In this article, we will outline what makes this threat so interesting: delivery chain, indicators of compromise, and use of a new post-exploitation framework that to our knowledge has not previously been used by threat actors.

July 2, 2019

IDS Bypass contest at PHDays: writeup and solutions

Positive Hack Days 2019 included our first-ever IDS Bypass competition. Participants had to study a network segment of five hosts, and then either exploit a service vulnerability or meet a particular criterion (for example, send a certain HTTP response) in order to get a flag. Finding an exploit was easy, but the IDS complicated things as it stood between the participants and the hosts, checking every network packet. When a signature blocked the connection, participants were informed via the dashboard. Here are details on the tasks and the ways to solve them.


June 18, 2019

Four ways to phish: how to avoid falling for scammers' bait


Phishing is one of the main cybersecurity threats targeting Internet users. Today we will describe how these attacks work and how not to become a victim.