ASIS secret letter
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The face is the index of the mind, its ASIS secret letter!
We have two images lets use binwalk on the jpg image:
$ binwalk a.jpg
Doesn’t look like it has something special so lets extract the files using binwalk again but with the parameter e:
$ binwalk -e a.jpg
Binwalk will create a folder with extracted files:
Checking the 38 file we can see we have a double encoded base64 string:
$ cat 38 | base64 -d | base64 -d
Stéganô is a python package for steganography which can be found here https://github.com/cedricbonhomme/Stegano
Now using stegano to extract something from png, there was two binaries in stegano we tried with stegano-lsb but it didn’t work so we tried with stegano-lsb-set with the generator triangular_numbers:
$ Stegano/bin/stegano-lsb-set reveal -i e07d17ed7d8104590ff3e17bdf052057.png -g triangular_numbers
And we got the flag!