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Thor’s a hacker now
Challenge
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
Looking at the file it looks like the output of od -tx2 or xxd. A bit of googling reveals that xxd has a flag -r which reverses the output. (I.e. cat a | xxd | xxd -r > b, a == b)
Once this is done
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$ cat writeupfiles/thor_7101f3b9690d5dc6c3afefa49d82e0526b278ec1c564139369ad22c28721d4cf.txt | xxd -r > tmp
$ file tmp
tmp: lzip compressed data, version: 1
# Apparently I need "lzip" and the file to be named tmp.lz to decompress nicely. There's a special circle of hell for software which cares about file extensions.
$ cat tmp | lzip -d > tmp2
$ file tmp2
tmp2: 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
Flag
IceCTF{h3XduMp1N9_l1K3_A_r341_B14Ckh47}