Spotlight on Troldesh ransomware, aka ‘Shade’

Threat analysis | Malware

Analyzing a new stealer written in Golang

January 30, 2019 - We captured a new information-stealing malware written in Golang (Go). Read up on our analysis of its functionality, as well as the tools researchers can use to unpack malware written in this relatively new programming language.

Threat analysis | Malware

What’s new in TrickBot? Deobfuscating elements

November 12, 2018 - TrickBot has been present in the threat landscape from quite a while. We wrote about its first version in October 2016. October 2018 marks end of the second year since TrickBot’s appearance. Possibly the authors decided to celebrate the anniversary by a makeover of some significant elements of the core. This post is an analysis of the updated obfuscation used by TrickBot’s main module.

Threat analysis | Malware

Fileless malware: part deux

October 5, 2018 - In part two of this series on fileless malware, our malware analyst walks readers through two demonstrations of fileless malware attacks and shows the problems with detecting them using static signatures.

Threat analysis | Malware

Reversing malware in a custom format: Hidden Bee elements

August 30, 2018 - When we recently analyzed payloads related to Hidden Bee (dropped by the Underminer EK), we noticed something unusual. After reversing the malware, we discovered that its authors actually created their own executable format. Follow our step-by-step analysis for a closer look.

Threat analysis | Malware

Fileless malware: getting the lowdown on this insidious threat

August 29, 2018 - In this series of articles, we provide an in-depth discussion of fileless malware and their related attacks. In part one, we cover a brief overview of the problems with and general features of fileless malware, laying the groundwork for technical analysis of various samples employing fileless and semi-fileless methods.

Threat analysis | Malware

Process Doppelgänging meets Process Hollowing in Osiris dropper

August 13, 2018 - Process doppleganging, a rare technique of impersonating a process, was discovered last year, but hasn't been seen much in the wild since. It was an interesting surprise, then, to discover its use mixed in with Process Hollowing, yet another technique, in a dropper for the Osiris banking Trojan.

Threat analysis | Malware

SamSam ransomware: controlled distribution for an elusive malware

June 19, 2018 - SamSam ransomware is a unique malware for its explicit human interaction on selected targets and care to erase most of its tracks.

Threat analysis | Malware

Malware analysis: decoding Emotet, part 2

June 7, 2018 - In part two of our series on decoding Emotet, we analyze the PowerShell code flow and structure. We also reconstruct the command-line arguments—for fun!

Threat analysis | Malware

Malware analysis: decoding Emotet, part 1

May 25, 2018 - In the first part of this two-part analysis of Emotet, we look at the VBA code, where you'll learn how to recognize and discard "dead" code thrown in to complicate the analysis process.

Threat analysis | Malware

Kuik: a simple yet annoying piece of adware

May 8, 2018 - Kuik adware, which forces affected machines to join a domain controller, is using this unusual technique to push Google Chrome extensions and coin miner applications. In this blog, we'll provide technical analysis of the adware and custom removal instructions.