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HACKvent 2015: Day 10

10 Dec 2015
CTF: Hackvent 2015
Link to challenge: http://hackvent.hacking-lab.com
Date Completed: 10 December 2015

Challenge

The following zip file was also provided: Download ZIP File

Solution

We notice that the zip file nasty-Shit.zip contains one zip file called 1.zip, that contains one zip file called 2.zip and so on. I also know that the file zile will keep getting lower and lower in file size the more we extract (due to ZIP headers and padding). Furthermore, opening the file in HxD (the hex editor) allows us to see the names of all embedded zip files. We see the number 30546.zip among many others so we know there are a lot of files here!

We write a quick python script to recursively extract each zip file.
Script:

Finally we reach the zip file: 31337.zip which is different from all of the other files.
This zip file contains one file called worst.500 and is password protected.

We use the glorious Accent Zip Password Recovery to crack the password in milliseconds.

The password for the zip file is: love

We extract the file, look inside and find the flag!

Flag:  HV15-iQYf-adNg-o4S9-JHc7-vfWu

 
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