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IceCTF - 55 - Thor's a hacker now - Misc

noraj (Alexandre ZANNI)
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Information#

Version#

By Version Comment
noraj 1.0 Creation

CTF#

Description#

Thor has been staring at this for hours and he can't make any sense out of it, can you help him figure out what it is? thor.txt

Solution#

  1. thor.txt is an xxd dump so just reverse it to get the binary: xxd -r thor.txt > thor.lz.
  2. Check what the binary looks like:
file thor.lz
thor.lz: lzip compressed data, version: 1
  1. We'll need he lzip lib and utility to manage that: apt-get install lzip.
  2. Let's uncompress the archive: lzip -d thor.lz.
  3. Now we get an image:
file thor
thor: JPEG image data, JFIF standard 1.01, resolution (DPI), density 72x72, segment length 16, Exif Standard: [TIFF image data, little-endian, direntries=5, xresolution=74, yresolution=82, resolutionunit=2, software=GIMP 2.8.18], progressive, precision 8, 1600x680, frames 3
  1. Just display it: display thor.
  2. IceCTF{h3XduMp1N9_l1K3_A_r341_B14Ckh47}
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