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Simple Stenography

Prompt

Think the flag is somewhere in there. Would you help me find it? hint-" Steghide Might be Helpfull"

https://ctflearn.com/challenge/download/894

Approach

  • The prompt hinted to use steghide, so I tried extracting an embedded file using the following command, but I was asked for a passphrase.\

    steghide -sf Minions1.jpeg
    

    https://imgur.com/QObMSo4.png

  • I tried looking in the file's metadata using exiftool, nothing seemed very obvious, but then I noticed a keyword field with the string 'myadmin'

    https://imgur.com/lpOSCi2.png

  • I tried using it as the passphrase to use steghide, and it worked!

  • The contents of the extracted file revealed an alphanumeric string that seemed like a base64 encoded string.

    https://imgur.com/HIDMVU2.png

  • Finally, I used a base64 decoder(https://www.base64decode.org/) to obtain the flag.

    https://imgur.com/ElafRPx.png

  • Flag obtained : CTFlearn{this_is_fun}