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PicoCTF2018 - Forensics - Recovering from the Snap


PicoCTF2018 - Forensics - Recovering from the Snap

Objective:

There used to be a bunch of animals[1] here, what did Dr. Xernon do to them?


Hints:
(1) Some files have been deleted from teh disk image, but are they really gone?


Solution:

I used foremost to recover the files from the DD image.

let's mount the DD to see what is inside visible to my OS

@kali:/$ sudo mkdir /mnt/disk_image
@kali:/$ sudo mount -o loop -t auto /home/circusmonkey404/Downloads/animals.dd /mnt/disk_image

let's see whats in there

kali:/mnt/disk_image$ ls
dachshund.jpg  frog.jpg  music.jpg  rabbit.jpg

4 files named after animals

let's through Foremost at it and see what it finds

kali:/mnt/disk_image$ ls
dachshund.jpg  frog.jpg  music.jpg  rabbit.jpg

Let's check and see what foremost found

@kali:~/Downloads$ ls
animals.dd  husky.png  incidents.json  output_Tue_Sep_24_10_45_31_2019  passwd
@kali:~/Downloads$ cd output_Tue_Sep_24_10_45_31_2019/
@kali:~/Downloads/output_Tue_Sep_24_10_45_31_2019$
ls

let's check audit.txt


here is the output from cat

@kali:~/Downloads/output_Tue_Sep_24_10_45_31_2019$ cat audit.txt
Foremost version 1.5.7 by Jesse Kornblum, Kris Kendall, and Nick Mikus
Audit File

Foremost started at Tue Sep 24 10:45:31 2019
Invocation: foremost -T animals.dd
Output directory: /home/*********/Downloads/output_Tue_Sep_24_10_45_31_2019
Configuration file: /etc/foremost.conf
------------------------------------------------------------------
File: animals.dd
Start: Tue Sep 24 10:45:31 2019
Length: 10 MB (10485760 bytes)

 Num     Name (bs=512)           Size     File Offset     Comment

0:    00000077.jpg          617 KB           39424    
1:    00001313.jpg          481 KB          672256    
2:    00002277.jpg          380 KB         1165824    
3:    00003041.jpg          248 KB         1556992    
4:    00003541.jpg          314 KB         1812992    
5:    00004173.jpg          458 KB         2136576    
6:    00005093.jpg          383 KB         2607616    
7:    00005861.jpg           39 KB         3000832    
Finish: Tue Sep 24 10:45:31 2019

 8 FILES EXTRACTED
   
jpg:= 8
------------------------------------------------------------------

 Foremost finished at Tue Sep 24 10:45:31 2019


8 files extracted, that's more then the 4 we saw originally

lets check out the jpgs found in the jpg folder

opening it up in the GUI

Here is the picture with the flag 00005861.jpg

picoCTF{th3_5n4p_happ3n3d}



















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