Bypassing IE and Edge XSS Filters with Double Encoding

IE and Edge both uses a default XSS filter which is not powerful like the XSSAuditor(Webkit/Blink).
This is how the XSS filter is implemented.

https://msdnshared.blob.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/swi/WindowsLiveWriter/IE8XSSFilterArchitectureImplementation_7E69/pic1_thumb.png
(source: https://blogs.technet.microsoft.com/srd/2008/08/19/ie-8-xss-filter-architecture-implementation/)
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Satana Malware Analysis

I haven’t done any malware analysis before and this would be my first post related to malware. I’m really interested but still quite a lot of things to learn 🙂 so I thought of starting off somewhere and this is the analysis of the ransomware named “Satana” by me. Obviously I hope you know who is Satan 👿

Samples:

Behavior Analysis

As soon as you run this the main executable will be deleted and a new sample will be created inside the %temp% folder.

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The following is the disassembly corresponding to this event.

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