Senobnesieh
task
lla ta siht rebmemer t’nod I ???senobnesieh deman retcarahc noteleks suolucidir siht s’ereht yltnerappa dna dab gnikaerb gnihctawer m’I. wow
Rory
steg
writeup
ok let’s grab this weird file
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| wget https://acmcyber.com/static/files/e8350154bad3f643/senobnesieh.lmao
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check the file:
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| file senobnesieh.lmao
senobnesieh.lmao: ISO Media, MP4 v2 [ISO 14496-14]
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It is an mp4 file and can be played. It sounds like some weird music.
The link behind wow is this:
https://github.com/JavDomGom/videostego
Videostego is a tool that you can use to write and read hidden messages in MP4 files using Steganography techniques like LSB.
let’s clone this repository:
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| git clone https://github.com/JavDomGom/videostego
Cloning into 'videostego'...
remote: Enumerating objects: 62, done.
remote: Counting objects: 100% (62/62), done.
remote: Compressing objects: 100% (51/51), done.
remote: Total 62 (delta 14), reused 55 (delta 10), pack-reused 0
Receiving objects: 100% (62/62), 3.20 MiB | 2.56 MiB/s, done.
Resolving deltas: 100% (14/14), done.
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and try to install it:
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| cd videostego
sudo make install 130 ⨯
[sudo] password for pascal:
2022/11/17 18:58:01 [build] Building videostego binary ...
gcc -Wall -g -o videostego src/*.c
2022/11/17 18:58:02 [build] Done!
2022/11/17 18:58:02 [install] Installing videostego ...
install -m 0755 videostego /usr/local/bin
2022/11/17 18:58:02 [install] Done!
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Ok that worked.
How can this tool be used?
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| videostego --help
USAGE
VideoStego [-f filename] [-w [-m message] | -r | -i] [-h] [-v]
DESCRIPTION
Tool to apply steganography in video files.
OPTIONS
-f, --file Input video file.
-m, --message Message to hide. It has to be specified only if the mode is -w, --write.
-w, --write Write mode. Hide a secret message in video file.
-r, --read Read mode. Read a secret message in video file.
-i, --info Info mode. Print general structure and containers of video file.
-v, --version Print the program version.
-h, --help Print this help.
LICENSE
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
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Ok we need to supply the input file as well as the -r parameter to read the hidden message from a video file.
Let’s try this:
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| videostego -f senobnesieh.lmao -r
flag{newer_mandela_effect_just_dropped}
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there is the flag !
