c4pur3 th3 fl4g

This room says capture the flag but its actually more a challenges room.

Yes there are flags…yes this is technically a ctf yes..

anyway, first part:

Translation and shifting

c4n y0u c4p7u23 7h3 f149? : we all know the answer for the leet code so I wont type that

01101100 01100101 01110100 01110011 00100000 01110100 01110010 01111001 00100000 01110011 01101111 01101101 01100101 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100000 01101111 01110101 01110100 00100001 : lets try some binary out!

MJQXGZJTGIQGS4ZAON2XAZLSEBRW63LNN5XCA2LOEBBVIRRHOM====== : base32 is super common in CTF’s

RWFjaCBCYXNlNjQgZGlnaXQgcmVwcmVzZW50cyBleGFjdGx5IDYgYml0cyBvZiBkYXRhLg== : Each Base64 digit represents exactly 6 bits of data.

68 65 78 61 64 65 63 69 6d 61 6c 20 6f 72 20 62 61 73 65 31 36 3f : hexadecimal or base16?

Ebgngr zr 13 cynprf! : Rotate me 13 places!

\*@F DA:? >6 C:89E C@F?5 323J C:89E C@F?5 Wcf E:>6DX : You spin me right round baby right round (47 times)

and next we got morse code

- . .-.. . -.-. --- -- -- ..- -. .. -.-. .- - .. --- -. . -. -.-. --- -.. .. -. --. : TELECOMMUNICATION ENCODING

85 110 112 97 99 107 32 116 104 105 115 32 66 67 68 : Unpack this BCD

And the last one made me go like…yo wtf!?

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Li0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0KLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLS0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLi0tLS0KLS0tLS0gLi0tLS0gLi0tLS0gLS0tLS0gLS0tLS0gLi0tLS0gLS0tLS0gLi0tLS0=

But it was just annoyingly long base64

which is decoded is just morse

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then binary

  01100110011001010010000001100000010111110110000000100000011000000110000001100101001000000110001001101000001000000110000001100000011001000010000001100010011000010010000001100000010111110110100000100000011010000110011000100000011000000101111101100110001000000110000001011111011000000010000001100010011000010010000001100000011000000110010100100000011000000101111101100011001000000110000001011111011001000010000001100000011000000110010000100000011000100110000100100000011010000110011000100000011000100110000100100000011010000110011100100000011000000101111101100100001000000110000001100000011001010010000001100010011000010010000001100000011000000110010100100000011000000110000001100011001000000110000001011111011001000010000001101000011010000010000001100000010111110110011000100000011000000101111101100100001000000110000001011111011000000010000001100000011000000110001100100000011000110110010100100000011000110110010100100000011000110110010�

ROT 47 again

fe `_` `e bh `d ba `_h hf `_f `_` ba ``e `_c ` _d ``d ba hf ba hg  `\_d `e ba `e ``c `\_d hh `_f `\_d `_` ``c ce ce c

ASCII plus plus (hehe)

76 101 116 39 115 32 109 97 107 101 32 116 104 105 115 32 97 32 98 105 116 32 116 114 105 99 107 105 101 114 46 46 4

Did you feel the levels of inception?

Finally the answer is: Let's make this a bit trickier..

yeah we all love tricks

Spectograms

I dont know what those are so google might be helpful (I google alot)

I downloaded the secretaudio.wav file and audacity to analyse the spectrograms

super secret message!

Steganography

Image downloaded

luckily there was no passphrase for steghide

steghide --extract -sf stegosteg.jpg
Entrez la passphrase:
�criture des donn�es extraites dans "steganopayload2248.txt".

the extracted text says SpaghettiSteg

security trough obscurity

we got a nice meme

steghide --info meme.jpg
"meme.jpg":
format: jpeg
capacit�: 3,4 KB
Essayer d'obtenir des informations � propos des donn�es incorpor�es ? (o/n) o
Entrez la passphrase:
steghide: impossible d'extraire des donn�es avec cette passphrase!

ok now there is a passphrase? that’s just extra steps

binwalk meme.jpg

## DECIMAL HEXADECIMAL DESCRIPTION

0 0x0 JPEG image data, JFIF standard 1.01
30 0x1E TIFF image data, big-endian, offset of first image directory: 8
74407 0x122A7 RAR archive data, version 5.x
74478 0x122EE PNG image, 147 x 37, 8-bit/color RGBA, non-interlaced
74629 0x12385 Zlib compressed data, default compression

unzip usually doesnt work we use 7zip

7z x meme.jpg

7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=fr_FR.UTF-8,Utf16=on,HugeFiles=on,64 bits,2 CPUs Intel(R) Core(TM) i5-6400T CPU @ 2.20GHz (506E3),ASM,AES-NI)

Scanning the drive for archives:
1 file, 80123 bytes (79 KiB)

## Extracting archive: meme.jpg

Path = meme.jpg
Type = Rar5
Offset = 74407
Physical Size = 5716
Solid = -
Blocks = 1
Encrypted = -
Multivolume = -
Volumes = 1

Everything is Ok

Size: 5562

Now another image (another one)…hackerchat.png

ok they said there was a secret ’text’ too…so lets open the meme as textfile

or use strings command

strings meme.jpg
...
J2!']
.8P/
'[SQP
S~j@6h
vA}=
\*s&\_\_
@9Xs
{@84
2$Es
i2Mc
IEND
"AHH_YOU_FOUND_ME!"
hackerchat.png

Yeah I found you! what are you gonna do now?

Notice how I didnt hide the answers for this room?

for me those are challenges and If you are reading this before even trying them yourself well…you already killed the fun anyway