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Analyzing a new stealer written in Golang

Golang (Go) is a relatively new programming language, and it is not common to find malware written in it. However, new variants written in Go are slowly emerging, presenting a challenge to malware analysts. Applications written in this language are bulky and look much different under a debugger from those that are compiled in other languages, such as C/C++. Recently, a new variant of Zebocry … [Read more...]

Malware analysis: decoding Emotet, part 1

Emotet Banking Trojan malware has been around for quite some time now. As such, infosec researchers have made several attempts to develop tools to de-obfuscate and even decrypt the AES-encrypted code belonging to this malware. The problem with these tools is that they target active versions of the malware. They run into problems when the authors of the malware change the code. The change could be … [Read more...]

Spartacus ransomware: introduction to a strain of unsophisticated malware

Spartacus ransomware is a new sample that has been circulating in 2018. Written in C#, the original sample is obfuscated, which we will go over as we extract it to its readable state. Spartacus is a relatively straight-forward ransomware sample and uses some similar techniques and code to others we have seen in the past, such as ShiOne, Blackheart, and Satyr. However, there is no sure relationship … [Read more...]

An in-depth malware analysis of QuantLoader

This guest post is written by Vishal Thakur, CSIRT/Salesforce. For more on Vishal, read his bio at the end of the blog. QuantLoader is a Trojan downloader that has been available for sale on underground forums for quite some time now. It has been used in campaigns serving a range of malware, including ransomware, Banking Trojans, and RATs. The campaign that we are going to analyze is serving a … [Read more...]

A coin miner with a “Heaven’s Gate”

You might call the last two years the years of ransomware. Ransomware was, without a doubt, the most popular type of malware. But at the end of last year, we started observing that ransomware was losing its popularity to coin miners. It is very much possible that this trend will grow as 2018 progresses. From the point of view of the victim, this is a huge relief, because miners are not as much of … [Read more...]