ABCTF - 35 - Virtual Box 3 - Virtual Series

Information#

Version#

By	Version	Comment
noraj	1.0	Creation

CTF#

• Name : ABCTF 2016
• Website : http://abctf.xyz/
• Type : Online
• Format : Jeopardy - Student
• CTF Time : link

Description#

This mysterious file was left here, but I have no idea how to open it. Do you? I left it in a folder named 2016 just for you.

Solution#

1. Go to C:\My Documents\2016 and there is flagfour.xlsx but we don't have Excel
2. Extract the file with a floppy disk
   • On your host create a floppy disk: fallocate -l 1474560 floppy.vfd
   • Mount it on the Win98 VM
   • Format it
   • Copy flagfour.xlsx on it
   • Eject the floppy
3. Retrieve the file on your host
   • Mount the image with a loopback device: sudo mount -o loop floppy.vfd /tmp/floppy
   • Open with libreoffice libreoffice /tmp/floppy/flagfour.xlsx
   • Content is ABCTF{FR0M_THE_FUTURE}
4. Enjoy the flag!