In some cases, it is not a pure XOR, but usually you can figure out the modifications by looking at the output. Try to find the key and the encryption algorithm (XOR based).One of them will be your searched payload (encrypted by a simple XOR-based algorithm) See the referenced strings – you will get names of the files that are opened. Find a DLL and the exported function, that will be used for unpacking.Decompress the package – you can use 7zip under Windows or a standard archive manager under Linux.UPDATE: See also and example of unpacking a similar crypter in a dynamic way, using memory dumping: Analyzed samples In this tutorial, I will show how to approach static decryption of such packages. Often, (but not always) they come with a standard NSIS icon: We can distinguish them by a NSIS tag on Virus Total: Nowadays we can encounter many malware samples packed by a crypter using installer scripts.
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December 2022
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