When, what and why As a national CERT we analyse all kinds of incidents. Some of them involve widespread APT campaigns, othertimes we just focus on everyday threats. Recently we got notified about a new malspam campaign targeting Polish users and decided to investigate. It all started with this phishing …

In late April we observed a malspam campaign delivering a previously unseen PowerShell malware. We decided to provide an overview of the campaign and some of the malware capabilities. We're also dubbing this malware family as "PowerDash" because of the "/dash" path on C2 server, used as a gateway for bots.

For the past two years we've been tinkering with a proof-of-concept decryptor for the Phobos family ransomware. It works, but is impractical to use for reasons we'll explain here. Consequently, we've been unable to use it to help a real-world victim so far. We've decided to publish our findings and tools, in hope that someone will find it useful, interesting or will continue our research. We will describe the vulnerability, and how we improved our decryptor computational complexity and performance to reach an almost practical implementation.

While working on our automatic configuration extractors, we came across a rather strange-looking Vidar sample. The decrypted strings included domain names of such organizations as the NATO Strategic Communications Centre of Excellence, Border Guard of Poland, Estonia and Latvia, and Ministry of the Interior of Lithuania. Automatically extracted strings from …

Guest post by our Google Summer of Code student, Manorit Chawdhry Project proposal: https://summerofcode.withgoogle.com/projects/#6209067233574912 Motivation Wait, what? Malware on Linux? Yup, you read it right. Linux malware isn't given much importance in our community, as Windows is the most targeted operating system for malicious attacks …

Guest post by our Google Summer of Code student, Jan Gruber Project proposal: https://summerofcode.withgoogle.com/projects/#6703931754807296 Overview My project for GSoC 2021 was to realize an undetectable simulation of human behaviour in the VMI-based sandbox DRAKVUF, which resulted in the contribution of a plugin named hidsim - short …

Table of contents Getting Started Your first karton Malware extraction with malduck Introduction Today we'll continue topics started in the first part of the tutorial. We'll learn about malduck, what can it do and how to write your own modules. Later we'll also show how to integrate it with Karton …

Table of contents Getting Started Your first karton Malware extraction with malduck Introduction In the last part, we've explained how to set up a simple Karton pipeline and start your tasks. If you haven't already, it's probably a good idea to read it now. Or you can clone the karton-playground …

Table of contents Getting Started Your first karton Malware extraction with malduck What is Karton? Karton is a framework for microservice orchestration, designed by security researchers for security researchers (but flexible enough to be used everywhere). It shines in scenarios where there is a clear separation of "input" and "output …

CloudEye (originally GuLoader) is a small malware downloader written in Visual Basic that's used in delivering all sorts of malicious payloads to victim machines. Its primary function is to download, decrypt and run an executable binary off a server (commonly a legitimate one like Google Drive or Microsoft OneDrive). At …