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Firas Chaib edited this page <relative-time datetime="2022-05-17T21:47:12Z" class="no-wrap">May 17, 2022</relative-time>
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<h1><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg>Description</h1>
I was told to find the secret message being sent over this packet capture, but I'm stumped. I've been told it has been hidden in some banner? Can you figure it out?
Note: this is not related to an http banner
banner.pcapng
As intuitive as it may sound, I went ahead and opened the file with wireshark
Well just to clarify : when I solved this challenge there were no hints provided, so I solved it in the following way :
After analyzing the packet capture a bit i went ahead and filtered the http requests :
I saw an http get request so I extracted it in raw :
now I tried to extract some data from the output file using binwalk and the result was a file system under the name squashfs-root
:
┌─[not1cyyy@0x45] - [~/Desktop/PatriotCTF/banner_FINISHED/_tcpdump.extracted/squashfs-root] - [mar. mai 17, 22:28]
└─[$] <> ls
bin etc mnt proc root sys usr www
dev lib overlay rom sbin tmp var
</div>now since the challenge name is "banner" I tried to find any file with that name so I ran the command find . -name "banner"
and here is the result :
┌─[not1cyyy@0x45] - [~/Desktop/PatriotCTF/banner_FINISHED/_tcpdump.extracted/squashfs-root] - [mar. mai 17, 22:31]
└─[$] <> find . -name "banner"
./etc/banner
</div>so I accessed the etc directory and ran cat
against the file named "banner" :
┌─[not1cyyy@0x45] - [~/Desktop/PatriotCTF/banner_FINISHED/_tcpdump.extracted/squashfs-root/etc] - [mar. mai 17, 22:32]
└─[$] <> cat banner
ad888 888ba
88888888ba ,ad8888ba, 888888888888 88888888888 88' 88 ad888888b, 88 88 88 ad888888b, ad888888b, `88
88 "8b d8"' `"8b 88 88 88 "" ,d ,d d8" "88 88 ,d88 88 d8" "88 d8" "88 ,d 88
88 ,8P d8' 88 88 88 88 88 a8P 88 888888 88 a8P a8P 88 88
88aaaaaa8P' 88 88 88aaaaa ,8P 88 88 88 ,adPPYba, MM88MMM ,adPPYYba, MM88MMM aad8" ,adPPYba, 88,dPPYba, 88 ,adPPYba, 88 ,d8 aad8" 8b,dPPYba, 8b,dPPYba, 88 88 ,adPPYb,d8 ,adPPYb,d8 aad8" MM88MMM ,adPPYba, Y8,
88""""""' 88 88 88""""" 88( 88 88 88 I8[ "" 88 "" `Y8 88 ""Y8, a8" "" 88P' "8a 88 a8" "" 88 ,a8" ""Y8, 88P' `"8a 88P' `"8a 88 88 a8" `Y88 a8" `Y88 ""Y8, 88 I8[ "" )88
88 Y8, 88 88 "8b 88 88 88 `"Y8ba, 88 ,adPPPPP88 88 "8b 8b 88 88 88 8b 8888[ "8b 88 88 88 88 88 88 8b 88 8b 88 "8b 88 `"Y8ba, d8"
88 Y8a. .a8P 88 88 88 88 "8a, ,a88 aa ]8I 88, 88, ,88 88, Y8, a88 "8a, ,aa 88 88 88 "8a, ,aa 88`"Yba, Y8, a88 88 88 88 88 "8a, ,a88 "8a, ,d88 "8a, ,d88 Y8, a88 88, aa ]8I 88
88 `"Y8888Y"' 88 88 88 88 `"YbbdP'Y8 `"YbbdP"' "Y888 `"8bbdP"Y8 "Y888 "Y888888P' `"Ybbd8"' 88 88 88 `"Ybbd8"' 88 `Y8a "Y888888P' 88 88 88 88 `"YbbdP'Y8 `"YbbdP"Y8 `"YbbdP"Y8 "Y888888P' "Y888 `"YbbdP"' 88
88, ,88 aa, ,88 aa, ,88 ,88
"Y888 888P" 888888888888 888888888888 888888888888 "Y8bbdP" "Y8bbdP" 888P"
</div>At first it may seem like random gibberish but by zooming out of the terminal you'll see the flag !
PCTF{just_at3_ch1ck3n_nugg3ts}
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