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This is what the CHARSET is here.īelow is a list of the major functions that are worth talking about:Īny of the other functions I did not mention here because they are either not directly related to the decryption/key searching, or they are just self explanatory. So, if the random number 38 was generated, it would have added the letter “c” to the victim ID string, since the “c” is at the 38th position if this is treated as an array. If you remember from when we were analyzing the RNG portion of Princess, the numbers being generated were used as an index to look up a letter in this string. # define CHARSET "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz " Lets start from the top of the main.cpp file.
#Malwarebytes id and key 2018 full#
I strongly recommend you follow along with full source code open in another window as you read this article. The full source code of this tool is available here: Princess Locker decryption tool source code. This will help the specific lines of code within each function make more sense when we are going through in detail. Let’s first walk through all the functions in this program at a high level and do a quick overview of what they are and how they are used together. The process of reversing engineering the encryption code and forward engineering the decryption code essentially covers the same point from multiple angles. However, just to solidify everything and make sure it all clicks, I will explain the details of this already functioning tool, as I believe it is much easier to understand something and create your own tools in the future if you see how an already-functioning one works. To continue off of that point, and to close off this series, we will be walking through the source code of the Princess Locker decryption tool, which my colleague hasherezade has created. After Part 4 of our series, you could have most likely used that information to create your own tool. We talked about the specific ways to narrow down the analysis toward the encryption portions, the weaknesses in this specific encryption scheme, the potential options we might have for decryption, and finally we made a game plan for creating a decryption tool. In the prior post, we walked through, in detail, the thought process while looking at the Princess Locker ransomware. We have reached the final installment of our Encryption 101 series.