Zip Madness

Solution

We get file named flag.zip. After unpacking it, it seems like we have to unpack 1000 other ZIPs depending on direction specified in direction.txt I used simple bash script to do it:

for i in {1000..1}
do
  `unzip -o $i$(cat direction.txt).zip`
done

Flag

​ nactf{1_h0pe_y0u_d1dnt_d0_th4t_by_h4nd_87ce45b0}

Credits

• Writeup by everl0stz
• Solved by everl0stz
• WaletSec 2020

License

CC BY 4.0 WaletSec + everl0stz