Category
Forensics
Description
It’s just one inside another…
Solution
The attached file is just a blank image. Using binwalk reveals that there’s two images in the file.
binwalk -e 87122c397ac8b10d53057a2c9ec1834e.png
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 PNG image, 499 x 389, 8-bit/color RGBA, non-interlaced
41 0x29 Zlib compressed data, compressed
234601 0x39469 PNG image, 499 x 389, 8-bit/color RGBA, non-interlaced
234642 0x39492 Zlib compressed data, compressed
But extracting data with binwalk doesn’t work, so let’s try foremost instead.
foremost 87122c397ac8b10d53057a2c9ec1834e.png
Processing: 87122c397ac8b10d53057a2c9ec1834e.png
|*|
Now we got a new image in the output directory. Opening the image we get the flag.
flag{4bs0rb3d}