Introduction In the last arcitle about Ursnif campaign have been presented the ursnif powershell downloader, which was also able to download the GandCrab payload. This payload was injected as DLL library into the running process and during the last analysis I have extracted it. Now, it is time to look more closely at this GandCrab sample. Obfuscated strings After a quick look at the disassembly we can notice many calls to one particular function, in our case named by IDA as sub_10009E69.
Introduction In the first part of this analysis have been presented the two types of macro-enabled documents with powershell downloader spreading via emails in recent campaign. The powershell downloaders and/or the macros were slightly obfuscated, however, it was easy to defeat this obfuscation and reveal their purpose. Unfortunatelly, during my analysis the downloaded content was not present on the involved servers and also in the most cases it was not available even during the analysis on sandboxes like Any.