Just like with RTF documents, adversaries can use XLSX spreadsheets to exploit the Microsoft Office Equation Editor. To add a little bit of complication on top, adversaries also sometimes like to e...

When adversaries buy and deploy threats like AgentTesla you often see this functional and entertaining chain of older exploitation activity with some .NET framework tradecraft you’d expect from som...

In my last post I walked through the analysis of an unusual MSI file that an adversary had tacked a STRRAT Java ARchive file to the end of the MSI contents. In this post, I want to walk through a m...

Adversaries can get really creative with ways to hide and execute payloads. In this post I’ll cover one instance where an adversary appended STRRAT to a MSI file to make it look legitimate during a...

I personally despise trying to analyze shellcode, but shellcode is becoming more common in malware of all types. From Metasploit and Cobalt Strike to GuLoader, loads of malicious tools include shel...

One of my colleagues made a statement recently about how commonplace process injection has become among malware, to the point where it seems adversaries don’t have to think about the injection tech...

Malware comes in all shapes and sizes, and in the case of BazarISO it comes in the form of an ISO file that contains a malicious shortcut and an executable. In this post I’ll tear apart the ISO to ...

A few different malware families have included Excel XLL add-in files as distribution mechanisms lately. These include IcedID and some commodity threats that HP’s security team documented as using ...

It’s been a little while since I checked in on Emotet to see how its first stage loaders are doing. Lately the first stage has been using Excel 4.0 macros to drop payloads, so in this post I’ll wal...

There are loads of different ways adversaries can distribute Cobalt Strike beacons and other malware. One of the common methods includes using HTML Application (HTA) files. In this post I’m going t...