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hello everybody my name is rahul and in this video well be taking a look at the unpacking challenge from the pico cdf going to need to capture the flag competition now this was a fairly easy challenge and well be trying to understand the basics behind it so it says that can you get the flag reverse engineer this binary so ill copy this link and what ill do is ill click on the web shell and it will prompt you for a username and password which ive already done it and what ill be typing here is wget this and as the name suggests it says unpack me upx so this gives me a type of hint that this has been compressed using a packer called as upx so what is upx let me just show you what is upx so upx is a packer and a compressor so it is generally used by malware authors in order to obfuscate the code now even if the code is obfuscated it will still run so this is one of the benefits of using a backer so let me try to run file and pacme dot upx and youll see that it is elf 64-bit lsb ex