Project Sekai - ✅-misc-machokes-flex

Machoke's Flex - 500 points

Category: Misc Description: Machoke is flexing so hard I can't seem to take my eyes off of him. Wait... Where's the flag? Author: Segal Files:

https://umdctf.io/files/cebca36a1db224a0953f583acd81607b/machokes-flex.zip?token=eyJ1c2VyX2lkIjoxNDcsInRlYW1faWQiOjY4LCJmaWxlX2lkIjo1MX0.ZExCLA.zN2nDOHjMa0-p3-6mOaBThq6uQM

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Sutx pinned a message to this channel. 04/28/2023 3:01 PM

@Violin wants to collaborate

@afterworld wants to collaborate

@Legoclones wants to collaborate

C++ binary

misc?

18:00

opengl

18:00

ok

opengl?

yah prob some engine

18:02

opengl in binary

ah yeah I see

not meant for rev ig

18:03

idk anything about opengl

same

1

@fleming wants to collaborate

@Sheep wants to collaborate

@TheBadGod wants to collaborate

chall is probably just to extract the model

04:30

or maybe patch the shader that we see something we should not be able to see

04:36

machoke.mtl

33.96 MB

04:38

yup, that's a penis inside the model

04:38

now where's the flag

TheBadGod

used /ctf submit

✅ Well done, challenge solved!

tf

04:55

had hardcoded array of "texture ids"

04:56

first texture generated has id 1, we generate all the characters, so we just have to subtract one from all the ids to get the characters they represent

04:56

so you find VNEDUG|xpx... and after transformation you get UMDCTF{wow_i_bet_you_never_saw_this_coming}

LOL wtf

06:48

nice guess

sahuang

nice guess

well, wasn't a guess in the end i actually looked what it does; it renders the chars somewhere

06:57

dunno where though, maybe modifying shaders would be enough too

ic