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The latest version of Emotet downloader has a few new updates. In this post we'll have a look at these updates.These are the new updates:Obfuscation pattern is different to that in the past (3942 lines of VBS code)Powershell.exe is copied over to Temp and executed from there (evasion technique)Only one payload URI - this is a major changeLet's take a look at the malware and analyse it. Infection vector is the usual phishing email with a Word document attachment. Once you open the document, it asks you to enable the macros. Once enabled, the code…

As an Incident Responder it's pretty common to analyse malicious emails, however finding the right tools, to safely pull apart an email, aren't always easy to find. I often find analysts struggle to pull apart an email once you explain the risks of using Microsoft Outlook as an analysis tool. This post will look at using open source tools within the SANS SIFT Workstation virtual machine to safely pull apart a native outlook email message. To start with, a native Outlook email message is in an .MSG file format. This format, unfortunately, can't be opened and viewed easily with a…

There's an interesting new malware that is currently being distributed actively around the globe through phishing campaigns. This malware is a Trojan RAT, that poses as a version of the popular open-source archive utility PeaZip. The authors of this malware have copied the file info and make it look like a legit version of PeaZip. Careful analysis of this malware shows us that this infact is a Trojan RAT, that is falsely adverstised as PeaZip. In this article, we analyse this malware and discuss the findings. There are strong indicators that suggest that this is a re-packaged version of DarkComet…

Introduction Keymarble is a trojan malware that has recently been seen in the wild. US CERT released initial information about this malware late last week which can be accessed here - https://www.us-cert.gov/ncas/analysis-reports/AR18-221A In this article, we analyse the malware and try to understand the execution flow. We also look at some useful network IOC that can be extracted from the malware. Some of these have been documented in the release that has been linked above. We'll look at some other IOC that have not yet been released publicly. This is a quick analysis that…

Following a presentation I did for a SANS community night in Melbourne Australia recently, I had a lot of attendees ask if I could provide the graphical timeline that I presented which showed the events leading up to the discovery of WannaCry in May 2017. Below is that timeline with events unique to the WannaCry variant that got a lot of attention in the mainstream news in May 2017. I've tried not to dive too far down the rabbit hole of the EternalBlue exploit, and its use in other malware - which is most certainly occurring in the wild. I've…

Machine Learning, Security Analytics, Behavioral Analytics, call it whatever you like, but will it really uncover hidden security incidents in your network? For the purpose of this article, I am going to refer to machine learning, security analytics, behaviour analytics, user based anomaly detection, and all the other flavours in between as "machine learning". Yes, I understand they can all be different and represent different areas; however, I want to discuss the application of machine-based detection being used to find security incidents versus human based detection. I have to say up front that I am not a data…