Bright Shadows - Special 7: "Filetypes" [made by Saemon]

Description:

Download the file and follow the instructions in it.

Download the challenge

_______________    _________

|enter solution|  |Check it!|

Solution:

1. First of all, download the file named filetypes.zip to your computer.

   sp@simple-plan:~$ wget http://www.bright-shadows.net/challenges/special_filetypes/filetypes.zip

2. Extract it, and read the readme.txt file.

   sp@simple-plan:~$ unzip filetypes.zip -d filetypes
   sp@simple-plan:~$ cd filetypes/
   sp@simple-plan:~/filetypes$ cat readme.txt
   Filetypes Challenge by Saemon for www.bright-shadows.net
   ========================================================
   
   Just get the password for each part then put the passes together and extract the final file with the solution.
   
   Don't try to bruteforce the final part - the password is very long.

3. Now we should follow the instructions to identify the files.

   sp@simple-plan:~/filetypes$ ll
   total 36
   drwxrwxr-x 8 sp sp 4096 Jun 8 06:00 ./
   drwxr-xr-x 51 sp sp 4096 Jun 8 06:00 ../
   drwx------ 2 sp sp 4096 Jan 3 2004 Final Part/
   drwx------ 2 sp sp 4096 Jan 3 2004 Part 1/
   drwx------ 2 sp sp 4096 Jan 3 2004 Part 2/
   drwx------ 2 sp sp 4096 Jan 3 2004 Part 3/
   drwx------ 2 sp sp 4096 Jan 3 2004 Part 4/
   drwx------ 2 sp sp 4096 Jan 3 2004 Part 5/
   -rw------- 1 sp sp 313 Jan 3 2004 readme.txt

4. Below is the result of first step.

   sp@simple-plan:~/filetypes$ file "Part 1/file"
   Part 1/file: PC bitmap, Windows 3.x format, 381 x 281 x 1
   sp@simple-plan:~/filetypes$ file "Part 2/part2"
   Part 2/part2: Zip archive data, at least v1.0 to extract
   sp@simple-plan:~/filetypes$ file "Part 3/part3"
   Part 3/part3: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed, RAR self-extracting archive
   sp@simple-plan:~/filetypes$ file "Part 4/thefile"
   Part 4/thefile: RAR archive data, v1d, os: Win32
   sp@simple-plan:~/filetypes$ file "Part 5/PART5"
   Part 5/PART5: # ISO 9660 CD-ROM filesystem data '20040103_0853'

5. We can append the appropriate file extensions to the files for passing this challenge.

   sp@simple-plan:~/filetypes$ mv "Part 1/file" "Part 1/file.bmp"
   sp@simple-plan:~/filetypes$ mv "Part 2/part2" "Part 2/part2.zip"
   sp@simple-plan:~/filetypes$ mv "Part 3/part3" "Part 3/part3.rar"
   sp@simple-plan:~/filetypes$ mv "Part 4/thefile" "Part 4/thefile.rar"
   sp@simple-plan:~/filetypes$ mv "Part 5/PART5" "Part 5/PART5.iso"

6. Let's fetch the password from each part.
7. Part 1:

   Open file.bmp and you will see the image like below.
   
   Of course, we got the password of this part. -> firstpart

8. Part 2:

   Unzip part2.zip and we'll get another file named file. Like always, we use file command to identify it.
   sp@simple-plan:~/filetypes/Part 2$ unzip part2.zip
   Archive: part2.zip
   extracting: file
   
   sp@simple-plan:~/filetypes/Part 2$ file file
   file: GIF image data, version 89a, 381 x 281
   
   Okay, it's the same trick. We append .gif to the file and we will see the image like below.
   
   The password of this part -> zipit

9. Part 3:

   Unrar part3.rar and we'll get another file named part3. Like always, we use file command to identify it.
   sp@simple-plan:~/filetypes/Part 3$ unrar x part3.rar
   
   UNRAR 4.00 beta 3 freeware Copyright (c) 1993-2010 Alexander Roshal
   
   Extracting from part3.rar
   
   Extracting part3 OK
   All OK
   
   sp@simple-plan:~/filetypes/Part 3$ file part3
   part3: JPEG image data, JFIF standard 1.01
   
   Again, we append the .jpeg to the file and check the image.
   
   We got this password. -> selfextracting

10. Part 4:

    Unrar part4.rar and we'll get another file named thefile. Like always, we use file command to identify it and append a appropriate extension to it.
    sp@simple-plan:~/filetypes/Part 4$ unrar x thefile.rar
    
    UNRAR 4.00 beta 3 freeware Copyright (c) 1993-2010 Alexander Roshal
    
    Extracting from thefile.rar
    
    Extracting thefile OK
    All OK
    
    sp@simple-plan:~/filetypes/Part 4$ file thefile
    thefile: Rich Text Format data, version 1, ANSI
    sp@simple-plan:~/filetypes/Part 4$ mv thefile thefile.rtf
    
    Open it with office or document software.
    
    We got the password. ->part4rulez

11. Part 5:

    This is an ISO file, you can use virtual disk to mount it. But I choose 7-zip to fetch the file from it.
    
    sp@simple-plan:~/filetypes/Part 5$ 7z e PART5.iso
    
    7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18
    p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)
    
    Processing archive: PART5.iso
    
    Incorrect big-endian headers
    Extracting solution
    
    Sub items Errors: 1
    
    sp@simple-plan:~/filetypes/Part 5$ file solution
    solution: Targa image data - Map 567 x 280
    
    You can open .tga file with image viewer in linux, or install image processing software like GIMP to view it. Below is the image content.
    
    We got the password. ->justtoeasy

12. Final Part:

    Use the password equals to "firstpartzipitselfextractingpart4rulezjusttoeasy" to extract the image which contains the answer from final.zip.
    
    sp@simple-plan:~/filetypes/Final Part$ unzip -P "firstpartzipitselfextractingpart4rulezjusttoeasy" final.zip
    Archive: final.zip
    inflating: Unbenannt.GIF
    
    Open the image file named "Unbenannt.GIF" and you will get the answer.