![]() 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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